The last Maserati road car to run the twin-plug DOHC six derived from the 350S sports-racer — a Frua-designed, Maggiora-bodied two-seat GT built 1963–1970 in coupé and small-production Spyder form; the direct successor to the 3500 GT / Sebring and immediate predecessor of the V8-powered Ghibli.
The Maserati Mistral (works designation Tipo AM109) was introduced at the 1963 Turin Motor Show as the strict two-seat successor to the 3500 GT / Sebring line. It was the first Maserati road car to carry a 'wind' name — Mistral, the cold northerly wind of the French Rhône valley — and, per Maserati.com's own model page and published production references, the last Maserati road car to use the twin-plug DOHC inline-six that traces back through the 3500 GT / Sebring to the 350S sports-racing engine of the mid-1950s. The successor Ghibli moved the marque's flagship road car onto Giulio Alfieri's 4.7-litre V8.
The body was designed by Pietro Frua and built under contract by Carrozzeria Maggiora of Turin — steel skin over a new rectangular-section tubular steel chassis developed by Alfieri (per the secret-classics.com history and published production references). A small run of lightweight alloy-bodied coupés also exists — RM Sotheby's 'Driving into Summer' lot text for chassis AM109/A1 1476 documents a 1967 Mistral 4.0 Alloy Coupé by Frua, 'clothed in lightweight aluminum alloy coachwork' and described in that same lot text as 'one of 828 Mistral coupes built'.
Mechanically the Mistral was offered with three engine sizes across the model run: the original 3.5-litre (Tipo AM109), a 3.7-litre (Tipo AM109/S) from 1964, and a 4.0-litre (Tipo AM109/A1) from 1966. Lucas mechanical fuel injection was fitted throughout on all series-production Mistrals (a first for a series-production Maserati road car). The transmission was a ZF five-speed manual as standard; a ZF-fitted automatic option is documented on later cars. Suspension is independent by wishbones and coil springs at the front, live axle on semi-elliptic leaf springs at the rear, with four-wheel disc brakes throughout.
Production totals diverge between sources. Published references give 844 coupés and 124 Spyders, while marque-club records and RM Sotheby's lot documentation cite 828 coupés and 125 Spyders. The Spyder engine sub-split is also disputed between two incompatible published breakdowns — 27 3.5-litre, 46 3.7-litre and 51 4.0-litre cars against 12 3.5-litre, 76 3.7-litre and 37 4.0-litre cars — and individual auction catalogues have aligned with one or the other. Total production should be treated as roughly 953–968 cars, split approximately 828–844 coupés and 120–125 Spyders. Any individual chassis should be authenticated through the Maserati Classiche department in Modena.
Three factors anchor the Mistral's collector position. (1) It closes the twin-plug DOHC six lineage — the last series-production road Maserati to carry the engine family that traces back to the 350S sports-racer, immediately before the marque moved onto the Ghibli's Alfieri V8. (2) The two body styles occupy sharply different market tiers: the Frua coupé is a genuinely accessible entry into 1960s coachbuilt Italian GT ownership at €80k–€180k EUR public-print money, while the ~120–125-unit Spyder is a properly small-production factory variant that has printed six-figure GBP and mid-six-figure EUR at public sale — up to £739,200 GBP at RM Sotheby's London 2016 (chassis AM109/SA1 657) and €736,250 EUR at RM Sotheby's Paris 2018 (chassis AM109/SA1 627), both figures quoted from the RM Sotheby's search-index snippets. (3) The car is Frua-designed and Maggiora-built — a coherent single design / build authorship, unlike the earlier 3500 GT's Touring / Vignale split — and is eligible for the full concours and historic-rally calendar (Villa d'Este, Salon Privé, Amelia Island, Mille Miglia Storica, Tour Auto, Colorado Grand, Modena Cento Ore).
Variants
Range and production
Variant
Years
Production
Notes
Mistral 3.5 Coupé / Spyder
1963–1966
Not separately recorded
The launch specification, with the 3,485 cc twin-plug DOHC six (Tipo AM109) carried over in evolved form from the 3500 GTi. Lucas mechanical fuel injection fitted throughout. The 3.5 Spyder count is disputed: one published production reference implies 27 × 3.5-litre Spyders; the alternative Conceptcarz split implies 12 × 3.5-litre Spyders. RM Sotheby's Monterey 2016 lot for chassis AM109/S 099 documents a 1965 3.5 Spyder by Frua at $412,500 USD Sold — a rare surviving factory 3.5 Spyder regardless of which breakdown is used.
Mistral 3.7 Coupé / Spyder
1964–1967
Not separately recorded
The mid-run 3,694 cc engine (Tipo AM109/S) — commonly quoted as the sweet spot of the range for combined performance and long-distance touring smoothness. The 3.7 Spyder count is disputed across two incompatible published splits: one published production reference gives 46 × 3.7-litre Spyders, while Conceptcarz gives 76 × 3.7-litre Spyders. RM Sotheby's Paris 2019 lot for chassis AM109/SI 613 quotes '46 3.7-litre Mistral Spyders built', aligning with the 46-unit split. The 3.7 coupé volume is folded into the overall coupé total of ~828–844.
Mistral 4.0 Coupé / Spyder
1966–1970
Not separately recorded
The 4,014 cc late-run engine (Tipo AM109/A1). The 4.0 Spyder count is disputed across two incompatible published splits: Conceptcarz gives 37 × 4.0-litre Spyders, while one published production reference gives 51 × 4.0-litre Spyders. RM Sotheby's Paris 2018 lot for chassis AM109/SA1 627 quotes 'One of only 37 4.0-litre Spyders produced; unquestionably the most desirable Mistral', aligning with the Conceptcarz split. The 4.0 coupé volume is folded into the overall coupé total. RM Sotheby's 'Driving into Summer' lot for chassis AM109/A1 1476 documents a 1967 Mistral 4.0 Alloy Coupé by Frua — a small tail of factory alloy-bodied lightweight coupés that trade on a chassis-specific basis rather than as a formally-cataloged sub-series.
Buyer's Guide
What to look for
Chassis, engine and body number authentication via Maserati Classiche
The primary due-diligence step on any AM109 Mistral is authentication of the stamped chassis, engine and body numbers against Maserati Classiche records in Modena. Chassis prefixes vary by engine and body variant: AM109 (3.5 coupé), AM109/S (3.7 coupé), AM109/A1 (4.0 coupé), AM109/S (3.5 Spyder), AM109/SI or AM109/S1 (3.7 Spyder), AM109/SA1 (4.0 Spyder). Confirm that the physical chassis and engine numbers match Maserati Classiche's record for the specific car — RM Sotheby's London 2016 lot for chassis AM109/SA1 657 (a 4.0 Spyder) explicitly cites 'Maserati Classiche documentation' as a value factor at the top of its lot bullets. Non-matching engines are not uncommon on cars of this period and are not necessarily a value catastrophe, but any deviation must be disclosed and priced in.
Body originality — Frua design, Maggiora build, and the alloy-coupé sub-set
The Frua-designed, Maggiora-built steel body has to be inspected for corrosion at the sills, floors, wheel arches, boot floor and around the rear light apertures — the standard 1960s Italian steel-body issues. On the Spyder, verify that the car is on the correct factory Spyder chassis rather than a coupé rebodied as a Spyder — a rebodied car is not a 120–125-unit Spyder and cannot command Spyder money. On the alloy-coupé sub-set (RM Sotheby's 'Driving into Summer' chassis AM109/A1 1476 is a documented example), verify the aluminium-alloy skin is factory-original rather than a later rebody; a factory alloy coupé is a chassis-specific rarity and must be certified as such through Maserati Classiche.
Mechanical inspection — twin-plug six, Lucas mechanical injection, ZF gearbox
PPI priorities on the Tipo AM109 six: cold-start behaviour, warm-oil pressure, cam-cover and head-gasket integrity, twin-plug ignition function on both coils. Lucas mechanical fuel injection is the fitment on all series-production Mistrals — the Lucas pump and metering unit are a specialist item requiring calibration by a recognised Italian-classic injection house; poor cold-start, uneven idle or hunting at part throttle typically trace here. ZF five-speed gearbox is durable but suffers from second-gear synchro wear; verify shift quality cold and warm. Rear axle: durable but check for whine and pinion-seal weep. Four-wheel disc brakes: verify Girling-correct componentry and full four-corner overhaul history.
Provenance, ownership record and Spyder rarity premium
A coherent chain-of-ownership file back to first delivery is a material value factor on all Mistrals and a decisive factor on the Spyder. The strongest recorded Spyder prints on RM Sotheby's data cite a Maserati Classiche certificate (London 2016 chassis AM109/SA1 657 at £739,200 GBP), an original-colour restoration with a full history file (Paris 2018 chassis AM109/SA1 627 at €736,250 EUR) or original-engine documentation (Paris 2019 chassis AM109/SI 613 at €522,500 EUR, 'accompanied by its original engine block'). On the coupé, well-documented cars with the ZF five-speed and factory Campagnolo magnesium wheels (RM Sotheby's Paris 2024 chassis AM109A1 1750 at €77,625 EUR) sit at the mid-market anchor.
Concours specification vs rally / tour specification
As with other 1960s Italian coachbuilt GTs, the market splits between concours-restored cars (correct Borrani wire wheels or factory Campagnolo magnesium, correct Lucas MFI calibration, correct paint code and interior specification per Maserati records) and quietly upgraded rally / long-distance touring cars (uprated cooling, hidden battery cut-off, discreet turn signals, occasional electronic-injection conversions to substitute for a hard-to-service Lucas MFI setup). Both specifications trade — but a car with a coherent single specification and full disclosure of every deviation from factory sells more readily than a car with an inconsistent mix. Any electronic-injection conversion in place of the factory Lucas MFI is a valuation deduction unless fully documented and reversible.
Ownership
Living with it
Typical mileage
1,000–4,000 miles typical — a well-sorted Mistral is a genuine long-distance Italian GT (Mille Miglia Storica, Tour Auto, Colorado Grand, Modena Cento Ore) and a concours mount; expect event-driven annual use rather than commuter mileage.
Service interval
Annual pre-season service by a recognised Italian-classic specialist; full mechanical inspection every 3–5 years or before any major long-distance event; Lucas mechanical fuel injection requires specialist calibration.
Annual running cost
£3,500 – £12,000+ / $4,500 – $16,000+ (dominated by agreed-value insurance, secure climate-controlled storage, annual Italian-specialist service, and periodic body / trim work intrinsic to a 1960s Italian coachbuilt GT).
Fuel economy
Approximately 15–19 mpg imperial in fast touring use; period-typical for the Lucas-injected twin-plug six.
Insurance
Agreed-value coverage via Hagerty Bespoke, Lockton Private Client or Footman James; on an exceptional 4.0 Spyder at $600k–$850k agreed value, expect $5,000–$12,000 / £4,000–£9,000 annual premium with mileage limit, secure-storage warranty and rally-endorsement clauses.
Maserati Classiche is the standing reference
A current Maserati S.p.A. (Classiche) certificate cross-referenced against the physical chassis, engine and body numbers is the standing reference for any AM109 Mistral. RM Sotheby's London 2016 lot for chassis AM109/SA1 657 explicitly cites 'Maserati Classiche documentation' as a top-line value factor. Renew the Classiche check at any change of ownership and on any material mechanical or bodywork intervention.
Route all work through a recognised Maserati specialist
The Tipo AM109 twin-plug six, Lucas mechanical injection, ZF five-speed gearbox and Frua / Maggiora bodywork are all Italian-classic specialist territory. Route body, mechanical, electrical and trim work through McGrath Maserati / Bill McGrath (UK), Emilia Auto Classica or equivalent Modenese specialists (Italy), or through Maserati Classiche directly. Non-specialist intervention will show in any subsequent inspection and be treated as a valuation deduction.
Event calendar
A Mistral is materially more valuable when actively campaigned or shown — Mille Miglia Storica, Tour Auto, Colorado Grand, Modena Cento Ore, Villa d'Este / Concorso d'Eleganza, Pebble Beach, Salon Privé. Event participation is a documented value factor and should be maintained during ownership rather than the car being left in static storage.
Common Problems
Known issues by system
Body — Frua design, Maggiora-built steel body over tubular chassis; small alloy-coupé sub-set
Corrosion at sills, floors, rear wheel arches, boot floor and around rear light apertures; rebodied Spyders (a coupé rebodied as a Spyder is not a factory Spyder); undocumented alloy-body substitutions
Major£20,000 – £120,000+ for a full body / paint rebuild routed through a recognised UK or Italian Maserati specialist; minor work from £2,500.
Symptoms — Bubbling paint at panel edges; visibly repaired sills or floors; body-number stamp that does not match the Maserati Classiche record; a Spyder whose chassis identity cannot be traced to the factory Spyder run.
Inspection — Full body-off or panel-off inspection at any comprehensive restoration; independent verification of body and chassis numbers against Maserati Classiche; on Spyder, confirm the factory Spyder chassis identity; on alloy coupés, verify factory-original aluminium coachwork.
Engine — Tipo AM109 twin-plug DOHC six, Lucas mechanical fuel injection
Aluminium head-gasket weep; cam-timing chain / tensioner wear; Lucas MFI pump / metering unit calibration; non-original replacement engines; undisclosed electronic-injection conversions substituted for the factory Lucas MFI
Major£10,000 – £40,000 for a full Tipo AM109 six rebuild by a specialist; £4,000 – £12,000 for Lucas MFI overhaul; £2,500 – £6,000 to revert an electronic-injection conversion to factory Lucas MFI.
Symptoms — Low warm-oil pressure; coolant weep around the head; poor cold-start; hunting at part throttle; visibly non-period injection componentry on a car sold as concours; engine stamp that does not match the Classiche-recorded engine number.
Inspection — Full compression and leak-down test; Classiche check on the physical engine number vs the chassis number; Lucas injection pump calibration by an Italian-specialist injection house; distributor drive and twin-plug ignition timing on both coils.
Second-gear synchro wear; input-shaft bearing noise; disclosed or undisclosed automatic-to-manual or manual-to-automatic conversions
Moderate£4,500 – £14,000 for ZF gearbox rebuild by a specialist.
Symptoms — Grind on 1–2 downshift; noise on the overrun; gearbox specification that does not match the chassis-number-era configuration.
Inspection — Verify shift quality cold and warm on all gears; confirm gearbox identity matches the chassis-era specification or that any conversion is fully documented; check driveshaft phase and rear-axle mount condition.
Brakes — four-wheel Girling disc brakes throughout production
Caliper seal and rotor condition; undisclosed non-period caliper substitutions
Major£3,000 – £10,000 for full four-corner brake overhaul.
Symptoms — Uneven pedal or brake pull; cold-brake bite deterioration; visibly non-period brake components on a car sold as concours.
Inspection — Full four-corner brake inspection; verify Girling-correct componentry; verify master cylinder and servo condition.
Electrics — 1960s Italian wiring loom, twin-plug ignition, period instrumentation
Original loom deterioration and fire risk; intermittent instrument function; incorrect replacement instruments; non-period electrical fittings
Major£3,000 – £8,000 for a full period-correct loom renewal.
Symptoms — Original 1960s loom still in service; instrument needles that stick or vary at constant speed; non-period switchgear.
Inspection — Verify the entire loom has been renewed within the ownership record; confirm any hidden battery cut-off or discreet turn-signal installation is fully documented and reversible; verify twin-plug ignition function on both coils.
Provenance — Maserati Classiche certificate, chain of ownership, matching-numbers documentation
Missing Maserati Classiche certificate; broken chain of ownership; undisclosed engine or body substitution; Spyder identity that cannot be traced to the factory Spyder chassis run
CriticalClassiche certification: application via Maserati S.p.A. — cost and lead time chassis-specific.
Symptoms — No current Classiche certificate presented; gaps in the ownership record; period documentation that does not correspond to the physical chassis / engine / body numbers on the car.
Inspection — Insist on a current Maserati Classiche certificate cross-referenced against the physical chassis, engine and body numbers; verify UK V5, US title, French Certificat d'Immatriculation, Italian Libretto or German Fahrzeugbrief chain of ownership.
Auctions
Recent results
Date
Auction
Car
Mileage
Result
2026-05-16
Broad Arrow
Concorso d'Eleganza Villa d'Este Auction
1966 Mistral Spyder 4000 (Lot 221)
—
€332,500
Sold
2026-05-16
Broad Arrow
Concorso d'Eleganza Villa d'Este Auction
1965 Mistral 3700 (Lot 110)
—
€132,250
Sold
2026-01-29
Gooding Christie's
Rétromobile Paris 2026
1967 Mistral (Lot 53)
—
€66,700
Sold
2026-01-23
Broad Arrow
Global Icons: Europe Online
1967 Mistral 4000
—
€93,500
Sold
2024-10-06
Bonhams
The Zoute Sale
1967 Mistral Spyder 4000 (Lot 129)
—
€356,500
Sold
2024-08-16
Bonhams
The Quail Auction
1968 Mistral 3.7 Spyder (Lot 140)
—
$335,000
Sold
2024-01-31
RM Sotheby's
Paris
1970 Mistral 4.0 Coupé (Lot 114)
—
€77,625
Sold
2023-11-04
RM Sotheby's
London
1967 Mistral 4.0 Spyder (Lot 262)
—
£297,500
Sold
Investment
Long-term outlook
Strong HoldHorizon: 5–10 years
Three anchored facts underwrite the Mistral investment case: (1) it is the last series-production Maserati road car to run the twin-plug DOHC six that traces back through the 3500 GT / Sebring to the 350S sports-racer — a defined end-of-lineage position immediately before the marque moved to the Ghibli V8; (2) the ~120–125-unit Spyder is a properly small-production factory variant with public-auction anchors up to £739,200 GBP and €736,250 EUR (both quoted from RM Sotheby's search-index snippets), well below contemporaneous Ferrari open-car money and coherent with other 1960s Modenese coachbuilt open GTs; (3) the coupé at ~828–844 units is the accessible entry into 1960s Maserati coachwork with wide public-sale coverage and consistent Modena / Classiche authentication infrastructure. Best long-term holds: a matching-numbers 3.7 or 4.0 Spyder with a current Maserati Classiche certificate, a coherent chain of ownership, and a comprehensive concours-standard restoration. Coupés are best held for use and enjoyment; the concours-restored matching-numbers coupé segment is a defensible medium-term hold rather than a growth trade.
Our view, not advice. This section is Car Collector International's editorial judgement on where this model sits in the collector market, based on the production, specification and market data set out in this guide. It is not a recommendation to buy or sell and it is not investment advice. Values can fall as well as rise.
The marque's own factory heritage and records department — the standing primary source for individual AM109 Mistral chassis, engine and body-number authentication. Every Mistral transaction should be routed through a current Classiche certificate check.
The recognised UK 1950s / 1960s Maserati specialist — parts, service, restoration and event preparation for the AM109 Mistral and its 3500 GT / Sebring / Mexico / Ghibli siblings.
European auction house with recurring Mistral consignments across the coupé and Spyder body styles. Results not individually verified during this review.
