The speaker being offered is not from the Fender days, it's either a replacement from the new Sunn company (a former Fender guy is part of that) that's being sold by Amplified Parts, or it's a run of new speakers that's entirely by Amplified Parts.
It has a custom label that's newer than the Fender/Sunn days. It's also possible that it's based on the Kappa metalwork, or a Kappa/Delta hybrid motor. These are all possible.
Since there are no TS parameters available, I would run away (especially at that price).