🔎 UNIDENTIFIED Please help my dad identify this mystery item!

[ChiefSchultz]

Last week, my dad and I were hunting some Civil War battlefield property and he dug this. I have no idea what it is and neither did any of the other folks that were there.

Do any of you experts have an idea? At some point, it had a design on the front but it’s worn pretty badly. I would say it’s about the same diameter as a quarter or a little larger. Thanks in advance!!!

 

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[dozer dan]

just a wag but I’m thinking that’s an old 1/4 turn fastener of some sort and it was turned with a square drive.

 

[ANTIQUARIAN]

It might just be my eyes playing tricks on me... but could this possibly be patent info?
Dave