It appears to be pewter but I can’t make out what’s up and what’s down View attachment 1895412
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It's a 19th century US military button. I see an eagle holding a shield!
I love the military buttons from this time period and have only ever found one. Searching hard for one of the script ones.
Truth those are some great buttons. I don't think there is anyone who puts that much work digging through BRICKS than you do. Well done.