An Uberti lever rifle of any model and in very good to excellent condition is worth $600
Average market value is around $750 used.
Best to have the rifle checked by a gunsmith familar with these guns as many people cannot resist the urge to fire high power ammunition, i.e. Cor-Bon and the like, in these guns and they end up messing up the locking toggles and/or battering the toggle stops on the frames, especially in the brass,(actually bronze), framed guns.
If the action feels loose when you cycle the gun and/or the lever wiggles a fair amount in side to side play, have the gun looked at before you buy.
Uberti will not warranty repair the guns if they determine heavy loads have been fired in it.
They will repair the gun, but the fees can be simply stunning.HTH