I'll do some photos of my two for comparison. I was mistaken as the one I have with the early markings is 1944, not 1945 dated although I completely agree with stencollector's remarks about the changeover. You'll see the grind line clearly on it. I cleaned up the ground butt socket on the other 1946 dated receiver with the later markings and reParkerized it myself. Both are excellent shooters. Love the .22's!