Can anyone speak to the virtues of the old Pumaster carbon steel blades? Is it all that much better than the 440c they're using in their top shelf line today? Had been wanting a Puma skinner fixed blade as the shape is what I consider perfect for my purposes. Saw the new, top end, made in Germany line with 440c going for around 150. Looking on-line I can find old 1960's era lightly used ones with the Pumaster carbon steel for the same money, or even less. Or in some cases much much more, if the knife is mint with box and papers etc. but I'm not looking for a knife to collect, i'm going to be using it and want EXCELLENT sharpness & retention. In the bit of research I have done, many seem to recommend going for the older knives. But not much substantiated reasoning for doing so. Could anyone comment?