Provenance and originality
Start with identity, paperwork and originality. For the Porsche 911 GT2 (997), the strongest cars have a continuous Porsche or recognised GT-specialist service file, original paint, matching numbers, both keys, complete books and tools, and — where available — the Porsche Certificate of Authenticity and factory build documentation. Original paint, low ownership count, complete Porsche history, sought-after colour, PCCBs within specification and both keys and books.

