The banner series was a lower priced Bushnell (they were still quite decent and, in that era, one of the better scopes for the price) and they came with BDC cams that would allow for (more or less) trajectory adjustments by dialing range. I have one of those in the "scopechief" series on my first .308 and if you use the correct load, it compensates very well. It came stock with several cams that suited common loads for several firearm cartridges. The BDC cam is for a firearm cartridge so it's not useful for AG.
Bushnell made some very good scopes, but this was one of the lower cost versions and made in large quantities. Try an auction site. I do not think you will get even $25 but I have been wrong before. no telling the desires of a collector