Seen them go for $600 up to $2200. It's according to the model. Vanguard, Delux, Lazermark, Terramark, all kinds of "mark". If it's a vanguard, and I am kinda guessing it is, then that is more than likely "top dollar" for that one. If it's a lazermark, jump fast and hard! Shove $800 in the mans hand before he has sense enough to figure out he is getting robbed! If memory serves, that scope is made by one of 2 makers. The earlier "weatherby scopes" were made by Hertel and Ruess and were pretty good scopes. You can tell it's one of them by the turrets both being on top. One is a focal adjustment and the other is the wind/elv combined. The later ones I BELIEVE but not 100% sure was an earlier Nikon make. Not a bad scope either for the time it was made. Was Nikons "fledgling" days of scope making.