45 rpm adapter from my 1979 Dual 701 direct drive turntable.
This 1936 campaign button belonged to Dad's brother Roy who was a member of the Civilian Conservation Corps. It is a bit less than one inch in diameter.
I've been cleaning out the garage. I found four of these that I bought years ago for spares.
It's now hanging on the wall in the computer room and the 1962 Beetle is long gone.