An inch of length in the model corresponds to 43 inches for the object being depicted in 1:43 scale. In terms of size, a 43-foot sailboat modelled in 1:43 scale would be 12 inches long.
Die-cast model automobile producers frequently use the 1:43 scale. Its origins can be traced back to British O scale model railway sets. It developed in popularity around the world, being somewhat larger than the 1:48 American O scale but comparable enough to allow accessories to be interchanged between the American and British O scales. In 1951, the first 1:43 scale miniature vehicle was released. A 1:43 scale automotive model is approximately 3.5 to 4.5 inches long.
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