I have a JJCO 1940 MKIII with what would look like all matching numbers, apart from fore-end, and with a 'D' prefix I think? Only thing is if you look at the nosecap number there is a 3 which is an upside down 2. The stock has been fitted quite nicely to the barrel and action but it is a mystery piece to me overall. The finish of the parts is all quite nice and the wood is somewhat colour matched.