Approx £10 tops imo. They are quite common, and not that good. The X20 examples aren't that much better, but they are better, and they in turn are worth approx £20 tops. In fairness however, either of the aforementioned are only really wanted by folk to dress period rifles these days, as it is possible to get hold of better scopes for plinking, like say a brand new AGS 4x32 off the BBS sponsor (JSR) for £15.99. Hope this helps . Atb: G.