Military button....... Solved Thanks guys!

[Mike from MI]

Trying to help ID this one. Any ideas? No back mark, the size of a quarter.

Thanks.

 

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[Bigcypresshunter]

Re: Military button.......

WWI collar disc?

 

[Bigcypresshunter]

Re: Military button.......

It must be WWI US Calvary.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280684424463+&clk_rvr_id=235358310673

There are different backs. Screwback?

 

[TheCannonballGuy]

It is definitely US Army World War One enlisted-man's collar Cavalry insignia. The letter "A" on it represents the soldier's company-unit. See the upper right corner of this chart.