This is the latest. I have wanted one since I was a kid and this one was a good deal. Got it from the original owner who purchased it new in 1963, the first year of production! Serial number block is consistent with a 1963 model. Former owner figured he had less than 200 rounds down the barrel. If anyone has an idea where to find factory open sights could you drop me a line? I checked Numrich, no joy. I'd like to put the sights back on for aesthetics only .