I have a Fazakerley No.4 Mk1/2 that has a matching bolt but their is no serial number on the barrel There the word "England" stamped in a semi circle pattern into the top flat of the barrel, ahead of the front part of the receiver. The barrel looks great. Does this mean that it was replaced at the factory? It doesn't have an FTR mark. It was made 10/49 Thanks for info on this.