Look like CTS alnico speakers to me. Probably original.

 

Appear to be the originals

 

Same factory original CTS alnico speakers that are in my '72 SR. Fantastic speakers.

 

I've seen identical speakers (same magnet stickers as well) in other '66 SRs so...I say original.

 

My first thought was Utah, but they all used the same parts back then (baskets especially) so hard to be 100% sure. The 66 tracks with other Utah speakers I have seen with nonstandard code formats. The CTSes I've seen do not have that stamp on the frame only a number on the cone; sometimes a 2 line stamp on one of the spokes but not the rim. Either way (Utah or CTS) probably original. Could also be Oxford.

There may be another stamp on the magnet under the sticker. If you feel brave enough to try to peel one of them back.

The relevant manufacturer codes are:
CTS - 137
Utah - 328
Oxford - 465

 

Many thanks gentlemen and/or ladies . These amps will be for sale soon .

 

Putting me in that room would fix just about everything wrong with me! I'm guessing the super and princeton are FAR from affordable, but how much would the little champ sell for?

 

Yes those are the original speakers.
"PI" is a date of production code. September 1966.

 

Congratulations on the finest black panel Fender amp, with the finest speakers. Fender transitioned from ceramic to CTS alnico speakers some time in 1966. It is a most excellent sounding combination