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According to Duchossoir, the last les Paul standards went out the door in October 1963. The Les Paul script on the truss rod cover was dropped. The only other Les Paul with markings was the Junior with the classic silk screen script that was also dropped after late 1963.After 1962 the Les Paul markings were no longer (a few dribbled into '63, I had one) -- check the pot codes 1376xxx with 6x giving the year and xx the week