I am not a rivet counter per se; however, I have to admit the Athearn 1:50 scale Model A Fords look tiny compared to my allegedly O-scale (and therefore alledgely 1:48 scale) MTH and Lionel engines and figures. And they certainly look tiny compared to the usual diecast vehicles that I have, which are allegedly 1:43 scale and 1:50 scale.
It's very challenging to find 1930's and late 1920's era vehicles...which IMO are in the classic car period, and am interested in what other's think of Athearn's 1:50 scale models. Perhaps they'd look right in an O-scale On30 or narrow gauge layout?
Finding "scale" models in this hobby generally appears challenging, and is really up to the individual to measure and compute, which I don't care to do. I have to admit that the now defunct European line of MTH scale models looked very nice and appealing. Allegedly, they were made to 1:45 scale, which seems a nice compromise between 1:43 and 1:50.