I've had this pick-up for 7 years and I"m pretty sure it's a Gibson classic 57 but I can't find the little tag on the back of the pick-up that proves this. Think I might have been drunk and peeled it off for no reason when I was a teenager or maybe it was one of my friends. Any way I'm trying to sell it and I'm sure the person buying it will want to have peace of mind.

My first thought would be to use a volt meter but then I'm not sure what I would be looking for.