I got out my Bear catalog CD and did some research for you. The only years when the Grizzly was both 56" and had green glass was in 1969 and 1970. Forest Green in 69, Glade Green in 70. Also, the 69 risers were one solid hunk of shedua and the 70 risers were two pieces of shedua laminated with a thin maple strip accent stripe running the length of the riser.

The catalog does not list a brace height, but shows an overall tip-to-tip length when strung at 53".

Hope that's some help.