I spoke with the seller. This is a 1953 K-Horn. He states it is a 2-way, which means it must have been a "special" or the official history is wrong (last official 2-way was supposedly made in 1952), or perhaps this unit was modified. The horn driver is a University, and it does have the modified K-5-J horn assembly (which has a "506" rather than the "444" model number).
So it has nothing in common with mine, except that both are 2-way speakers, and both might have the same woofer (mine was modded with an un-documented 1953 Jensen), and both might have the same finish.
So one of these might be in for major modification. And if the other speaker has a 3-way crossover, then I guess I could modify both, as I have plenty of high frequency Jensen drivers I can add.
Seems like this K-Horn is causing me more potential problems than it actually solves. It sure is tough to pair up an old K-Horn with a somewhat close mate.