Some bows are just more collectable than others, really not a reason why I guess. I personally like the looks of the bows with the "horns" or "caps", that's all. I bought a '76 KH a few months ago that is the closest to a new bow I own (I'm not sure it had EVER been shot).
Anyhow, that bow is 50# and I can't shoot the 2216's I use in my Kodiaks (45#, 47#, & 53#)and Super K's (45# & 50#). I had to up to a little longer 2219 to get proper flight. It's the hardest shooting Bear I own.
It's struck my curiousity so much I've kicked around taking it to Black Widow just to compare it to my Widows on their chronograph.