Trap,
Great thread idea - a featured vintage archery item every week... Don't know that I can "enlighten" as you suggest, but guess I should try to chime in...
Yes, Prior to the 1961 green glass production models, Bear made at least a few 52" bows. In 1961 the 52" bows produced on the same form, became known as the Kodiak Magnum.
The one I have is marked... EXP 52" 68#..., There are no silk screens on either limb, so the bow was finished without a name designation on it.
The glass on the back and belly are the same as a 1960 Kodiak and the tip overlays are the same as a 1960 Kodiak. The riser is a laminated 3-piece I-Beam bubinga 40/20/40. In addition to the one I have, I have also seen a couple of others, one has white glass on the back and belly.
The fact that the Bear Bow name Magnum was not introduced until the 1961 Catalog, may leave questions for some regarding the proper classification of pre 1961 52" bows.
Obviously, there is legitimate evidence to refer to it as either an "EXP 52" 1960 Kodiak" or an "EXP 1960 Magnum".
I usually have it displayed as the bottom bow on the display of 1960 Kodiaks as it has the same color glass and to my eyes, it seems to fit nicely in the descending order of lengths, 64", 60", 56" & 52".
However, I make reference to it in either manner mentioned above.