Have you noticed the dial-backs for dials made from 1925 to 1935 have the Caliber stamped on the back?
Some are difficult to see, others jump right out.
I've put together a random selection of dials from that era.
I don't know the extent to which this was done, but some example Calibers you'll see are 501, 157, 330, 179.
Vintage Gruen Watch Discussion Forum
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