Unusual? Yes. But it's a nice loud Gibson humbucker from 1976/77. The DCR is 7.8Kohm with
13" of lead on the signal coil and 5" of lead on the hum-canceling coil.
Unusual for two reasons. One, because it's potted, Gibson tried this for two years on various models.
Two because it's got leads from both coils brought out to facilitate wiring a coil-cut switch, phase
switch or series/parallel configuration.
The pole-piece screws are adjustable through the potting.