i won't exactly say i "have knowledge" but the Bisonic is a single coil. maybe it is a "split single coil in humbucking position" like a pbass or mustang bass?
Yeah, the Bisonic pickup is a single-coil. The adjustment screws throw some people off, but when you adjust 'em you realize the screws just raise & lower the slugs surrounded by the coil.
The "split-coil" P-Bass & Mustang bass pickups, OTOH, are legit humbuckers. The coils are arranged differently than most HBs but they accomplish the same thing.
Humbucking pickups go back further than many folks realize. National used a bridge position HB in their New Yorker archtop pre-WWII. They apparently never tried to patent it…maybe the war got in the way. I've played a c. 1941 example of this guitar. The pickup sounded great…clear & very even toned. Strong too. I don't know what kind of magnets or wire were used but the DC resistance measured over 8KOhms.
Had to laugh at the M-75 (not even called a Bluesbird!) being referred to in the catalog as a "three-quarter size" guitar. Now I get why some folks I've met have thought all Aristocrats & hollow BBs were short-
scale guitars.
-Dave-