RTY:
That would be a 56" bow with a 43# draw-weight @28". A 56" bow can be tough to shoot. However, the lower draw-weight will provide some forgiveness. Finger-pinch when at full draw can be a problem.
As for the 1953 patent mark, that does not mean the bow was actually made in 1953. The bow could have been made earlier or later than 1953.
Here is a link that will tell you some things about your bow.
http://www.neoreality.com/archery/beargray.htm
As for 43# for hunting; with the right shaft and the right broadhead (recommend cut-on-contact heads), the bow will get the job done. I shot several deer, and once dropped a 245 lb buck, using a
40# American "Cheetah", using early cone-head, 6-bladed, Wasps.