Small brass thing

[garwoodboy]

I found this today and I am not really sure what it is it is made of brass and is about a inch diameter

 

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[ticndig]

maybe a spindle washer . still made to this day .

 

[Rookster]

Or a camber washer or both.

 

[A2coins]

If it was rubber it looks like my pinpointed gasket lol