✅ SOLVED Help with a flat button.

[JohnnyMac]

Measures 20mm diameter. Can make out PHILA on the back. Can make out the makers mark. I belive it may begin with an M.

 

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[TheCannonballGuy]

Your brass 1-piece flatbutton find is a US Army 2nd Infantry Regiment Officer's button, made in Philadelphia by George Armitage, sometime between 1808 and 1825.

It is shown in the button-book by Alphaeus H. Albert as button GI-53-R2-G.

Sidenote:
The McGuinn-&-Bazelon book on backmark time-dating says George Armitage was a "plate worker" who immigrated to the US from Sheffield England. His US Officer buttons were made of what is called "Sheffield Plate" -- which one of the earliest versions of Silverplating. Hence the term "plate worker" for Mr. Armitage's profession.

 

[JohnnyMac]

Very nice info. Thank you