I literally just bought a Lee Enfield SMLE with a four-digit serial number and it has a bunch of armorer's stamps on the receiver. I believe eight in total believe it or not. With it being such a low serial number and with as many proof marks on it, I can honestly say it was indeed an issued rifle in World War 1 and maybe the second one as well. only problem is that it was sportorized some time in its life and I'm trying to bring her back to former glory. Any help on a stock (top and bottom) and a front hardware set would be amazing! ill have pictures up soon!