The Mercedes-Benz 280 SE 3.5 Cabriolet (W111) is the final iteration of the pre-safety 'stacked headlamp' cabriolet body introduced in 1961, and — with the parallel 280 SE 3.5 Coupé — the last truly hand-built Mercedes-Benz series production car before the marque moved to the R107 SL and the later modular platforms of the 1970s. Introduced in the autumn of 1969, the 3.5 replaced the earlier six-cylinder 280 SE Cabriolet with an all-new alloy V8 — the M116 3.5-litre single-overhead-cam per bank unit with Bosch D-Jetronic electronic fuel injection. The M116 is the same engine in European and US markets, but output was quoted under different standards: approximately 200 PS DIN in European specification and approximately 230 bhp SAE gross in US specification — the same engine measured under different standards; US-market cars did not make more power. A total of 1,232 280 SE 3.5 Cabriolets were completed between 1969 and 1971, of which 347 were built for the 1971 model year, the model's final year.
Mechanically, the 3.5 is the mature W111 Cabriolet: fully independent suspension, four-wheel disc brakes, power steering and four-speed automatic transmission as the overwhelmingly common specification (a floor-shift version was optional and is the more sought-after configuration today — the RM Sotheby's Arizona 2026 catalogue for the Tina Sinatra car cites 'sought-after late-production example with floor-mounted shifter'). Period equipment on US-market cars ran to Behr air conditioning, Becker Europa AM/FM radio with automatic antenna, power windows, whitewall tyres, tinted glass and folding centre armrest (all quoted from the verified RM Sotheby's Miami 2026 and Monterey 2022 catalogues). The convertible top itself is the defining item: a fully-lined, stacked-German cabriolet top with a concealed headliner over a hand-fitted timber and steel frame, and the source of the widely-cited '16 hours of hand labour' figure.
The Cabriolet is the low-volume half of the 280 SE 3.5 family (the Coupé had its own separate production run and is a distinct body style / market). Within the Cabriolet's 1,232-unit total, the values ordering by market runs, in descending order: US-market cars with (a) factory-correct rare colour combinations, (b) numbers-matching M116 V8, (c) full documentation (data card, window sticker, service booklet, tools and manuals), and (d) either Mercedes-Benz Classic Center or Brabus Classic full restorations — see the auction results section, all four of which are verified directly from RM Sotheby's lot pages on 6 July 2026.
Three facts anchor the 280 SE 3.5 Cabriolet's collector position. (1) It is Mercedes-Benz's last hand-built cabriolet: only 1,232 examples were completed in three model years (RM Sotheby's Monterey 2024 catalogue quotes the figure verbatim), and the 1971 final-year run was just 347 units (RM Sotheby's Miami 2026 and Monterey 2022 catalogues both confirm). This is a defined, closed production figure, not a market opinion. (2) The public-auction record from RM Sotheby's alone spans a genuine six-figure ladder: from $252,000 USD (verified Arizona 2026 Lot 172, ex-Tina Sinatra, black-repainted car) through $302,000–$324,000 USD (verified Monterey 2025 Lots 159 and 207) to $478,000 USD for a Brabus Classic-restored Dark Red / Black example (verified Monterey 2024 Lot 235) and $676,000 USD for the fully Mercedes-Benz Classic Center-restored Silver-Grey Metallic / Black car from the Iannelli Family Collection (verified Monterey 2022 Lot 359) — see auction results for verbatim quotations. (3) The 3.5 Cabriolet is the standing benchmark for post-war Stuttgart craftsmanship — the last car where 16 hours of hand labour went into the convertible top alone (RM Sotheby's Monterey 2024 and Monterey 2022 catalogues both quote this figure) — and it is fully eligible for Pebble Beach, Amelia Island, Villa d'Este and Salon Privé concours entry as a preserved or Classic Center / Brabus Classic-restored example. Factory-supported service continues through the Mercedes-Benz Classic Center in Fellbach (DE) and Long Beach (USA).
