Well most die cast have a sticker (silver or gold rectangle) that has how many were made. And only certain ones are individually numbered (Elites, club cars). The standard cars do have a registration number, but that isn't the same thing. If you got the car at a retail store (Wal Mart, Target) then there are over 100,000 of them made and you cant track them. The are collectible to a certain extent, but not as much as the pricier cars.