I remember a 1950's US movie (fiction) where the sports car drivers in a club race were given self adhesive numbers by the race organiser.
Self adhesive numbers were around in 1958 and Cooper used them to good effect to enable both drivers to qualify with the one 2.2 litre car.
But I understood that most people had permanent white roundels and used "tyre paint" (the black paint that the likes of Bernie Ecclestone, Roy Salvadori, Frank Williams and other S/H car dealers used to make the tyres of their sales stock look as good as new.) The paint could be cleaned off with a rag soaked in petrol and a new number put on next week.
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