If it helps (and for what it's worth), I have had several of these. Sold a near mint early MkII with both of it's interchangeable screw-in barrels for £165 face to face, bought a nice condition later MkII which only had one of its two barrels for £70 posted, have seen a well below average MkI (but with both bayonet fitting barrels) struggle to achieve £125 posted, and a myriad of MkIIIs (single barrel) go for around the £75 mark -- again posted . HTH: Gareth W-B.