I had a model 1950 in 7x64 but it had no side safety, just a wing safety, so sold it. I think the model 1952 had the extra safety and some other features. In between, in 1951, I think there were transitional ones but still marked M.1950. I'm a bit surprised that the magnum model is marked 1950 though. The Shooter's Bible around this period will describe the 1950 and 1952 models faetures, but I thought the magnum turned up around 1958 or thereabouts. The Mannlicher's Collectors Club should be able to be more specific.