Peter, I think you would enjoy digging around on the history of your bows. There are a lot of guys around who lived through the lives of the Super Grizzly. For example, I was in high school when the Super Grizzly was first offered as a upgrade to the VERY popular Grizzly. The Grizzly has been around in various design iterations since the mid-1950's, and that includes some great-looking and great shooting bows, but there have been no design changes since 1970, just some materials changes. One of the features that helps date your bow is the reddish stripe in the riser; that was a feature common to the Super Grizzly and the Super Kodiak in 1973 and 1974. Bear reintroduced the Super Grizzly about 5 years ago to offer, once again, an upgraded Grizzly with tip laminations to make the bow fast-flite string compatible. The mid-70's Super Grizzly is a solid bow, overshadowed perhaps by the Super Kodiak and the Kodiak takedown.
Ben Pearson bows are a whole 'nother ball game. Ben Pearson made more models than any other manufacturer and they cover the spectrum in terms of designs and materials. With their manufacturing capacities, they made tons of very affordable bows as well as some of the most expensive, advanced bows of that era.