Button But what Era?

[KYMD1983]

I know that it is a button, but can anybody tell me what era?

 

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[PBK]

U.S. Air Force, post-1947.

http://www.waterburybutton.com/user-cgi/patterns.cgi?catg=Military&subcatg=Military&page=2&id=10492

 

[KYMD1983]

Thanx