I wondered about the absence of SISTEMA on the pistol,so i asked that question on some other forums and got a few different answers. The first was that the slide MIGHT be one the Hartford slides. The other was that the first 500 pistols produced had Colt .45 and that there are 4 different slide markings. I don't know who's right but it really doesn't matter as the pistol is a joy to shoot. Wish i could find another one for what i paid for this one.
Thanks,Mike