In 1:43 scale, one inch of the model’s length corresponds to 43 inches of the object being depicted. In practical terms, a 1:43 scale model of a 43-foot sailboat would measure 12 inches in length.
Popular among manufacturers of die-cast model vehicles is the 1:43 scale. It began with British O-scale model train sets. Slightly larger than the 1:48 American O scale, but comparable enough to allow accessories to be used interchangeably between the American and British O scales, it gained worldwide popularity. The first 1:43 scale model vehicle was released in 1951. A 1:43 scale automobile model is between 3.5 and 4.5 inches long.