The sole issue in December 1958 was the third racing car, a BRM in British Racing Green. I have seen examples with racing numbers 1, 3, 7 and 17 and I believe that is all that were issued. The RN 1 seems pretty scarce and the one I have seen may have had a replacement transfer added at some time - as I didn't get a close look at the actual model, I cannot be sure. QDT list one which may indicate there were some issued although that doesn't really mean it's any more genuine.
This is a very simple model and is correct without a driver. He doesn't appear until much later when the model gets a new coat of paint, suspension and the number 152S.
It should have larger tyres on the back and normal car or van size on the front. Most models have a brown-yellow interior but a variation with a silver interior can be seen.
The wheels will usually be the smooth, fixed type but a few very late editions are around with the cast, spoke effect, wheels that were also used on the Aston Martin.