There is no need for a car to have a chassis number to be in the archive as long as there's a way to distinguish the cars. A lot of US-built single seaters weren't allocated chassis numbers so they can either be given artificial retrospective numbers (like the South African LDS F1 cars were) or just use the first owner's name, as was done for some of the Millers Indy 500 cars.
So 'the Pugh car', 'the McGrew car', 'the Cuthbert car' and so on are perfectly acceptable ways of working.
Allen
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