Help with collar button ID please

[Mr. Digger]

It's not a traditional button with shank, and I have never found one before. Maybe it is a collar stud? It has a "C" on it. Any ideas? I was hoping it might be military.

 

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[Johncoho]

Its cool, but I have never seen anything like it before.

 

[vpnavy]

I moved ya from TODAY'S FINDS! over to WHAT IS IT? for more exposure.