Early "Vibramute" tremolo unit. No "mosrite of California" marking.

'65 "Vibramute" with a "Nokie Edwards" type tremolo arm.

'65 "Vibramute" with "Don Wilson" type tremolo arm.

'65 "Moseley". Tremolo arm is fixed to the tailpiece differently from "Vibramute".
The screw hole is open to the tremolo arm side.