Depends on what you really mean by, "invest". Buy low and sell higher at a later date? Or do you just want to buy one because you believe you ought to have one? If you just want one to beat around in a pickup truck, that's fine. If your wanting some collector value, you probably should just concern yourself with the pre-64 version. And then there's whichever vintage you personally find more appealing, but you plan to shoot it anyway. For instance, I find the carbines made in the late 1930's to about 1948 to be particularly attractive if they are in good condition, but well worn with most of the bluing worn off to a silvery-grey patina. Any that are like-new, of that vintage, not only cost too much, but l just don't find compelling, as they lack the mystery and authenticity of the ones that are veterans of many seasons in the field. And then there's the model 55; what a beautiful version of the '94 that is! I say, take your time and look around at the older ones at the gun shows and the buy-sell-trade kind of gun stores. Wait until you find one that's particularly compelling. After all, you don't really need another rifle. With over 7 million model 94's out there, there will be another one to cross your path.