Eagle button at 1850 homesite... Military?

[AceofBases]

Can anyone help ID this design? Two piece, roughly the size of a nickel.

 

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[fishstick]

General Service button, ruffly TOC timeframe.

 

[Yak1366]

WWI to WWII

 

[fyrffytr1]

Can you read the backmark? That will help date your U.S. Army "Great Seal" button. I cannot see any traces of a black finish on it so it would date from 1910-1917 or after 1923. Your version has the earlier rounded rim and I have seen where it was dated prior to the late 1920s or the mid 1940s. After that a more angular style rim was used. Hopefully someone here can educate us on when the change did happen

 

[AceofBases]

Another photo of the front and one of the back here. I haven't cleaned the back completely but I don't see a makers mark or date yet.