One of my favourite guns. Value? well I reckon a rough one missing its rearsight about £20 to £30 (YES WE ALL KNOW VIRTUALLY ALL GUNS ARE WORTH MORE BROKEN AS SPARES) and seen them advertised up to £140 . I picked up a really good one for £65 I think and have seen them on here in the £45 to £60 region needing a bit of tlc. Budget for a mainspring and piston washer and maybe a breech washer although the latter is easy to make out of leather. The main fault found with these guns is that the cocking slot on the piston can wear to the point where the gun wont cock. RED BOB on here has welded one up for me and a few others as well and it seems to sort it out. I have sent him the piston without a cylinder abd it usually takes a few minutes with a bit of wet and dry to get it to fit spot on. If you only want to plink, fitting a Diana 25 manspring makes it very easy to cock. I did one for my niece like this. The other thing with these guns is sometimes the 4ba screw on the LHS of the cylinder that locates the trigger block is chewed. I had to drill and tap one to 3ba but usually use a 4ba brass screw with the head cut off and a slot cut in the top of the thread. I think they are a great fun classic