Les Paul Professional specifications
1969 Gibson Les Paul Personal / Professional owners manual - page 6
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The final side of this brochure continues the specifications of the Les Paul Personal (just the recommended action) and details the full specifications of the Les Paul Professional. Like the Personal, the Professional has a British Honduras mahogany for the body and neck, but a Brazilian rosewood (as opposed to ebony) fretboard and the standard white holly headstock veneer.
The cord listed is also different - because the Professional lacked the vocal microphone jack, a simple mono cable was all that was required - not a stereo like the Personal.
Perhaps surprisingly, the suggested string set is not the same as for the Personal - the #640 strings mentioned are still medium gauge with a wound 3rd, but Stainless Steel (rather than Nickel) with a heavier bottom end: .012 - .057 - presumably explaining why the suggested string action for the lower strings is slightly higher for the Professional than the Personal.