This is a Centralab 500K ohm potentiometer. It was made in the 25th week of 1960. Note that one of the lugs was cut off, and the center lug was grounded to the case, this particular potentiometer was used as a tone pot. This pot has the 2-piece bushing, though some did have a 1-piece cast bushing as well.
~Dave Paetow

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