Since the design and stamping be the same no matter if it was a chrome or zinc plated version? If so we should be able to compare either - Just a thought.
Early car reproduction verse originals have slight differences in the sharpness of the large outer ring letters and the slight size difference between the inner fonts
Below are some examples - Top center is identified as a reproduction (not sure how old of a reproduction
Lower left and right were labeled as originals. Interesting that there were two different versions of the stamping. Not sure why nor have I studied these in depth