As Doc said, the '63 Kodiak Magnum 52" Type I was recalled because of crackup problems. There was not enough glass to wood contact where the limb meets the riser. It was replaced with the Type II. That model also had some crackup problems so Bear issued the Type III. It does not have as dramatic a "dogleg" design as the Type I & II models did. This seamed to solve the problem.
The 60" Kodiak Dogleg, the "tiger Killer", never did have any real issues with it. I have three of them and all solid shooters.
The problems with the Type I & II 52" Magnum gave the Type III and the 60" Kodiak and undeserved reputation. Many uninformed enthusiest will tell you to never string a dogleg of any length, much less shoot them. This is what Doc would refer to as "Bull Shrimp"
If you are ever fortunate enough to get your hands on a '63 Dogleg Kodiak, shoot he crap out of it. Many Bear enthusiest hold a three way tie between the '59, '63' & '64 Kodiaks as being the best shooting hunting bows that Bear ever made.
My favorite is the '64 with that distinctive "Thunk" it makes when shot.