, me stumped. Usually fair at guessing how these would have been "fabricated", either mint error or by Little Johnnie in the Garage.
Ah, there it is. At the 3 o'clock to 5 o'clock position on reverse is the flattened edge. Those " Reeding Marks" are the pattern of a vise's grip area. Was put into a vise and squeezed. The mark on reverse is a deep scratch( PMD) the edges around are raised up.
OR
It was held flat in a vise and something with a design was hammered into it, would explain flattened rims.
. (See below)
*** Edited by Staff - Removed: The OP will have zero clue what you're talking about. ***
w/Coop, Or if in a vise, one side was against wood, some vises have wooden inserts for woodworking use. This would explain why just one edge area is flattened.
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