Found an old US pin. Help

[olekyground]

Hey guys,

found a really neat US pin. any ideas as to where it goes and what era is it from? WW2? Vietnam? THANKS!

 

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[Hill Billy]

I would say WWI Collar disc.
Cool find

 

[lost hunter]

 

[RFrady]

It is a WWII Unclassified Disk Type (Type III variation). This was the last variation of the screw post collar insignias.

 

[olekyground]

Thank you guys very much for helping! HAPPY HUNTING