Some food fer thought:
If the speaker code is on the cone, it could be a recone w/ old stock cone. Later date code on the frame is suspicious. 17K gauss is a pretty powerful gap I would presume good efficiency and no low end (don't matter in a guitar speaker) an impedance curve would be telling. Whizzer cones are one way to get better high dispersion with larger speakers. 12's have all the hi frequency dispersion of your average 5 cell (free w/ coupon) Radio Shack flashlight. The small(er) cone helps spread the highs out a bit. Speaker design is a compromise, big cone = better bass, but once the frequency's wave length equals the cone diameter, dispersion tightens up. Little 1" and smaller cones & domes spread the highs around but can't push enough air to make lower frequencies audible.
I personally wouldn't give much for the cabinet. A caddy is a nice car, but with a couple hundred thousand miles of taxi duty makes it not such a great deal. 3 16 ohms & an 8 tells us that who did the repair was either ill informed, or just threw in what they had on the shelf without a care as to the consequences. That cab was rode hard and put away wet. If it was Noddy Holder's or Tommy Bolin's Maybe. Abused by a no name so & so... unh unh. I seem to remember that Ampcabinets had similar cab in much better shape that was allegedly owned by notariety, but without certification it was only worth a couple hundred. This is probably worth less, Fanes are nice drivers, but not as revered as certain lettered Jensens even though they are probably of better quality. Tell your friend thanks but no thanks- unless he can prove that it was Pete Townshend's. In described condition $100-125 is generous.