Hi guys,,,,you're exactly right - that speaker is the Jensen C12K. What's really amazing is that I've cussed ceramic speakers forever (had that BIG Fender Twin w/ the 15" ceramic and I sent it back; didn't like the tone)
Always loved JBLs and I have O'Dell's old Standel that Paul restored and gave to me, it has a 15" Altec Lansing and I love the sound of it. Point is, I hated ceramic speakers until I played this '65 reissue - - it does NOT sound like any other ceramic speaker I have ever heard before.
When I got this amp a couple of years ago, I immediately called Paul and told him it was the best thing I had ever heard for a fingerstyle amp (or country/jazz/pop/whatever you play), and we had both heard and played thru many of the older ones. Well, he came over to my house and played thru it.....HE was impressed with the sound, so since HE felt that way I knew it had to be pretty darn good! Shortly after that, Paul got one himself one and that reinforced my belief even farther.
Chuck, I'm anxious to hear how you like the Emincance Lil Texas 12" neo,,,,I'll bet its a good sounding speaker too.
Something else I wonder about now and that is,,,,,if the Jensen Special Design 15" would sound as good as its 12" counterpart? Paul said, "well you never can tell, it might not since they're two different animals and a 15" just has different qualities from a 12" speaker".....so, I never persued that any further. The Jensen Special Design doesn't seem quite as "hot" as a JBL, it sorta reminds me more of the Altec speaker, a little "flatter sound" (great for jazz stuff, big chords or single string), however, it has plenty of mid-range which you need to get "balls" when you're thumb-pickin' - - maybe that's why I give the edge to the Jensen even over both the Lansing speakers. All this is just my opinion but I've heard enough super pickers in 50 years to know what sounds good and what doesn't to my ears.....

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Anyway, "hello" to both you guys, Bill and Chuck, I've missed seeing you at CAAS over the last several years, maybe I'll get started back one day,,,I read your posts all the time and enjoy them. I don't post much anymore, I'm sorta 'out of the loop' these days but I do enjoy most subjects here on the Chetboard.
Ya'll talk care, Gayle