Thanks teknoid! Hope I don't have to sell any of these any time soon.
Actually there were at least 2 generations of Cornwall II, as I understand it:
"The Cornwall II*, introduced in June of 1959, maintained the same low frequency driver (Eminence) and cabinet design. The primary change was a new exponential tweeter horn/driver combination and a new midrange driver. The tweeter afforded extended response and an improved polar pattern. The midrange driver was primarily a ''transparent" cost reduction, since the earlier driver was the same as that used in the Klipschorn, and as such, had to be padded down significantly to match the Cornwall's bass system. During 1981-1983, the midrange driver went through three major variations. The K-51-V and K-55-G were ceramic magnet versions (two vendors) of the Atlas K-55-V. The "final" version was a Heppner K-52-H. However, this was soon replaced with a Klipsch-built clone, the K-52-K. Obviously these tweeter and midrange changes required corresponding crossover network changes. The total result of all variations was essentially the same, and provided significantly smoother, extended frequency response. Additionally, the horns and woofer were flush-mounted into the baffle to slightly reduce diffraction effects."
Also, the pair I got came with all paperwork, which ID's it as Cornwall II