Jack, I do like the Howard bows I own, but I just don't shoot them as well as my Widows. I'll save the argument for another thread, but 50 years of quality and service from a top-flite company with a top-flite product speaks for itself. I do intend to do some hunting with my Howard Gamemasters someday.
Now, on to identifying these bows. The Tamerlane appears to be a 1963, which was the first year it was produced. In 64 they installed the sight plate and brush rest in all of them. Your K-Mag appears to me to be a late production 1961, judging by the fact it is an I beam riser. I bet it has "Grayling Green" fiberglass which is kind of an Avacado colored green. That would cinch it as being a 1961 (also the first year for that bow). The Grizzly has Zebrawood and brown glass, making it a 64 or 65. If the first number of the serial number starts with a 5, it's a 65. Any other and it's a 64. It's also a 58" AMO Grizzly, I'd bet. Really cool finds. The Grizzly could tell a few tales I bet! It appears you are infected with the bow gathering fever. Take care, Cameron