That should be a Super Wiz 80. If it's a runner with a 40" B/C then it's worth $100-$200 depending on condition (that's my opinion anyways). Less if it's not a runner. That bar will NOT work on your 7700 Poulan however. It does have a 3/8" slot (and your Poulan is one of the later models in that series with the 3/8" rather than 5/16" studs), but the tail profile and oiler hole placement is wrong for your Poulan. A SW80 would have the large frame Homelite mount (Oregon F014), while you need an XL-series Homelite (or old Jonsered) mount bar (Oregon D096/D196, Windsor UXL/TXL, etc). I'll bet Ric (Sawbones) will have a long bar in the mount pattern you need. I have an NOS old style Oregon 28" sprocket nose .404 bar in that pattern that I might part with too....
Just my luck! I think I already contacted Ric, but he only has a 28" bar, which I already have. Trying to find at least a 36"..............