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The earliest example will be a 1955 Porsche 356 T1A GS Carrera Coupé, which will be joined by the first model to wear the ‘RS’ badge, the homologation-special 911 2.7 RS.
These and 10 more will be on show at the Honourable Artillery Company HQ in London for the event’s fifth running, on 8-10 June.
Also confirmed for the Swabian showcase are a 911 930 turbo, a one-of-292 Porsche 959, once the world’s fastest road-legal car, and a 997 GT3 RS.
The 12 Porsches will form one of 11 classes and features at the London Concours, alongside the Italian Berlinettas set revealed last month.
“When it comes to significant marques in the world of motoring, they don’t come much bigger than Porsche,” said Andrew Evans, London Concours Director.
“Throughout the marque’s history it has created some of the most important and collectable cars in the world, and undoubtedly some of the world’s greatest driver’s cars.”