Around 1960 Lone Star struck a deal with Tootsietoys to manufacture a range of 1:50 scale replicas of current American cars. ... The models sold in the USA as Tootsietoys were also found in Britain as Roadmasters (2nd generation now written as one word minus the hyphen) and there do not seem to be any differences between those sold in the two countries, apart from the name engraved on the baseplates.

... Among the features were quite a few which had not appeared on Lone Star cars before, such as plated window glazing, suspension and plated parts. Neither the cars nor the early boxes carry any reference numbers but the catalogue lists them in a sequence from 1470 to 1482.

(From the book Lonestar, The Toy Company and Its Model Cars, by Andrew Ralston)