old Button

[alabama11]

Maybe ww1 period, but rang up like brass. No brass remains. Backside is totally plain with no embossing. Size equals a dime. Spainish American Hospital was across street. Digging all deep signals.
Happy New year to all. Thanks for looking.
Added a back view of button per request of Crusader. Thanks Crusader.

 

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[CRUSADER]

Hard to tell from the photo & we need a reverse shot, as it maybe an 18th C pewter type??

 

[Wildcat1750]

Interesting design but no clue. Reminds me of a Meso-American calendar...

 

[CRUSADER]

I don't think its a button anymore, maybe a cap?