Can anyone tell me what kind of button this is?

[damz68]

Is it important? And, what time frame is it from?

Thanks
Derek

 

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[PBK]

It appears to be a c. 1940's U.S. Army enlisted man's collar disk. It would have been worn on the right collar; a disk bearing the soldier's service branch (artillery, cavalry, infantry) or corps insignia would have been worn on the left collar.