Any clue

[sunnysidekid]

This is a brass disc, 1/4" think and 1"diameter...looks so familiar but still no idea.

 

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[TooManyHobbies]

What's the back look like? Wheel of a toy car? Button?

 

[trapperart]

Wheel off a toy?

 

[sunnysidekid]

The backside looks smooth with a pronounced nub in the center, but no grooves like previous side.

 

[vpnavy]

..: Moved from Today's Finds! over to Our Discoveries > What Is It? for more exposure :..​

 

[Old Pueblo]

It looks like an old shotgun shell, maybe.