I looked for a good thread on the union stamps and couldn't really find one. Since this subject came up in the post your hats thread today, I thought I'd start one where we can consolidate what we know. I'll start with this 1917 ad that states the Young Hat Co was the first mfg to use this union stamp for straw hats. The ad was in a fall edition of the American Hatter from 1917.
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