Re: Tele Lead Antiquity ?'s
You might be able to get some indication by holding the poles of one pickup against the other and seeing if they attract or not. If they do attract, then one is reverse polarity relative to the other one.
Duncan's and Fralin's do mix beautifully once you get the phase issues worked out.
My buddy AJ uses a Fralin Steel Pole 43 with a Duncan SSL-1 neck and middle pickup. I did have to reverse the wires on the SP-43 to get it in phase.
I use a Fralin Tele stock neck pickup with a Duncan Jerry Donahue bridge pickup and did have to reverse the black and white wires on the Jerry Donahue...as well as move the ground wire on the bottem of the JD to the white wire.