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cmokingAl, I thought all the 1931 W502s were blank backed? In fact, I thought all the W502 that were blank backed were in fact not the 1928 W502 issue but a different issue from 1931 and should not have been categorized as W502.
How do you tell a 1928 W502 One Bagger from a 1931 W502 One Bagger?