1960s DeArmond RHC-B 210 Soundhole Magnetic Pickup

These are classic. They're also getting pricey these days. They're simple single-coil pickups with 6 poles (the B-string one is hidden/recessed for volume-balancing reasons) and a Strat-like coil design. They're wound pretty hot, though, and have a clean, kerrangy, brighter sound which sounds so very good when sent to an amp that's pushed a bit into light "dirt."

This one is all-original and in good order, though the rubberized outside of the cable is cracked in a few places. This is really typical. The braided shield in the cable is good to go, though.

If I were installing permanently in a guitar, I'd attach a ground wire from shielding tape at the bridge plate (to make connection with the pins) to the ground of the jack. For a tailpiece guitar, one could run the ground to the tailpiece.