✅ SOLVED Medical Button?

[bvannada]

Need help with this. Button, pin? Not sure , thanks for your help. Size of a quarter.

 

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[TheCannonballGuy]

It isn't a button... it is a US Army collar-insignia disc for the Medical Corps. The version of iron sheetmetal "back" and attachment pins we see on yours means it was manufactured sometime between 1942 and 1970. For proof of that identification, and photos, go to the following webpage and scroll down to the World-War-2-&-later discs.
Dating Metallic Insignia: Collar Disks

 

[bvannada]

Thanks so much for your help. I will check it out.