The first model car made exactly to 1:43 scale seems to be French Dinky Toys No. 24R Peugeot 203, released in 1951, but many diecast iron or plaster toys in the 1920s and 1930s were also made about the same size, though not as precision 'blueprint' reproductions.
The first model car precisely scaled to 1:43 is believed to be a French Dinky Toys No. 24R Peugeot 203 released in 1951. However, many diecast iron or plaster toys from the 1920s and 1930s were also made around that size, though not as detailed replicas.