The bridge version of the Seymour Duncan '59 pickup. The output is not high, but the Alnico V magnet feels like it hits the amp harder than an Alnico II pickup. The pickup has a mid-scooped EQ, compensating for the more mid-focussed sound most bridge pickups have. The sound is a bit less vintage than for example the Pearly Gates, but has a better crunch sound.
The pickup has 4-conductor wiring, allowing you to coil-tap it. In coil-tap mode the sound is rather weak, and it is not anything I would ever really use.
I used this pickup in an Epiphone Les Paul Traditional Pro. The polepieces did not line up perfectly with the strings. The trembucker version of the Pearly Gates didn't either though. It should not make much of a noticeable difference to the sound if the polepieces line up perfectly anyway.