It was fitted to a couple of other rifles during it's service career before being fitted to your rifle. Quite typical. Incidentally, most of the Greek war reserve magazines are numbered the same way without the "L" stamped in.

Hey Krinko, you got me going since today's the 66 anniversary of the Normandy invasion. I had to take a 71L, '44 LB out on my range this afternoon before dark in honour of my two cousins who were killed in Western Europe in 1944. One was Alvin H. Dick, 1st Armoured Personnel Carrier Regt., R.C.A.C. and the other John F. Lovell, Essex Scottish Regt. R.C.I.C.. They're buried in Dieppe and Antwerpen respectively. Brian