[rotorwrench]

I seem to remember that those last brass cars only had one short cut out on the top inside edge. The ones above have the long one and the shorter cut out in the top edge.

Speedometers were more of an option in the early years. The other thing I'd like to mention is that there were a lot of reproduction parts made over the many years since production ceased. I've seen reproduction parts with the same patina as those. They may very well be original but there has been a lot of water under the bridge in 100+ years since.