What is it??

[ordfill992]

While detecting in a neighbors yard, I came across this piece. Of military origin and slightly smaller than a penny, the reverse is blank, and appears to be made of copper or brass?? Any ideas??

 

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[boomer]

token

the wording i think would be for the 31st field artillery battalion.
when i was in the army, to play pool or pin ball machines at the local service mens clubs you would exchange your money for tokens. boomer