Bear made a few different colors of these. I have the "Golden Bear" model, which is all yellow. They also made a red model. Each color was a different weight. Red was 15#, Yellow was 30#, and Brown was 45#.
I seem to remember doing some research and seeing mid 70's - post this over in the collecting forum and you'll probably find some Bear guys that could help narrow it down.
Honestly the most valuable part of this set I think is the box and arrows. Those graphics are in awesome condition. I bought my bow (just the bow) at an auction for $8, and I shoot it a lot. I keep it around for anyone new to shooting because it's got a shelf on both sides and is only 30#.
Regardless, they're cool pieces of history to own. Hope this helps some.