Here's a vintage guitar trivia question that will seriously test the serious geeks...
When Seth Lover's PAF humbucking pickup was finally patented, the patent number was supposed to appear on the pickup, replacing the "Patent Applied For" designation. The patent number Gibson placed on the patented PAFs was not the patent number granted for Seth Lover's humbucker, however.
The patent number on Seth Lover's humbucker pickups...what Gibson guitar part was the patent number really for?