Need help identifying button

[countrycody16]

Found this button today. I know it's a Waterbury co button and I can't find the years these buttons were worn please help me if u know thanks

 

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[fyrffytr1]

It's a "Great Seal" button. The official button of the army from 1902 until present day. There is a thread here on the forums showing all known backmarks and their dates.
Here's a link: http://www.treasurenet.com/forums/what/112828-great-seal-button-backmarks-help.html