Thanks, guys!
I've tried to do some research online on my Ibanez. From what I've been able to find, it's one of the very earliest '75's (no serial number or "stinger" on the back of the headstock, no rubber strip, black pickup covers with open tops, pickguard that goes under the bridge, not around it, etc.). It's all original, including the pickups and electronics. The pickups are ink stamped 15110, for January of 1975:
https://ibb.co/7SnVVRc
https://ibb.co/DzJNcmm