MikeinRome
One Too Many
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I think the Lot Number of that Derby dates to about the mid 1910's, so that might be about the era of your hat. That's the best guess I have.I found a derby from the same era for sale on eBay with a similar looking treatment on the backside of the sweatband but it still has the lot number visible. Maybe it's just worn off over time on mine. Being that it's on a slicker surface the ink may not penetrate as well. View attachment 597174 View attachment 597175 View attachment 597176