Penny sized coin whatsit

[myelo1023]

This disc is the exact same size as a penny...but very very thin. It rang in a great silver tone, but after warm peroxide, I'm not so sure. I cannot see any discernible markings on it, and is probably a nothing find, but wanted you guy's opinions. Thanks!


Third pic is obverse side

 

[mastereagle22]

It's about the thickness of a Tax token here in MO. Don't know anything else to compare it to.

 

[ASSEMblerEX]

electrical conduit punch out ?

 

[CRUSADER]

button?