Need help with ID and Age Military Button.

[lonelyduckhunter]

Found this last week just getting around to posting pics. Guessing General service button. Any info on age? Back is completely gone on it size of a quarter. Thanks!

Front

Back

 

[traderoftreasures]

almost looks like a staff officers button.

 

[kyphote]

Looks a lot like this U.S. General Staff Officer button except the shield on that button contains 5 stars and yours appears to have 7. Seems likely your button falls into this category though. Date would be CW era if this is the case.

 

[Kieth-Tx]

They are correct, General Staff Officers. It is in Tices Button Book, GS 13 C, 23 mm, page 293. Manufactured by Waterbury Button Co. Probable Civil War.