The piece shown is not a fake but an original MonteRosa, the simpler sister brand of Montblanc, presumably from the 1960s; a nib exchange is no longer possible on this old model. Even with old Montblanc models there are by now many replicas, so that the warning about fakes also applies in the vintage area. Binding price lists for older Montblancs do not exist; the book Collectible Stars offers price and rarity classes; current market prices can best be derived at fountain-pen fairs or by observing online auctions. For a normal MonteRosa, depending on model variant, colour (export colours are rarer), preservation and nib material, a range of around 25 to 50 euros is realistic.