This tuner was returned to Peterson in 2009 for factory service (have receipt for $160 in my name) and it was brought back to factory specs. I asked for it to get anything it needed including all new knobs. They would only replace the selector knob (key) because of low stock. Unit is well used but not damaged. Works perfectly. I was told by the technician it was likely the first year, 1973 according to the serial number.
Cash only no shipping