The 1955 dated Long Branch receivers I've seen were all replacements and had the original serial numbers of the wartime rifles stamped on when the worn out receivers were replaced in Canadaicon. It's entirely possible that some of those wound up in the shipments to Greece. As mentioned above by BAR, they were used up and through the 1970's and possibly even later. I've also got a rifle here with a replacement receiver numbered in the 95L range. The whole rifle is original 1950 95L parts and the receiver is a 1944 Maltby No.4Mk.1! Go figure.