I have a Colt #3977xx, it DOES NOT have the propery of US Government stamp on it, all other factory markings are correct. My question is, Did "ALL" the 1911's made at this time have it? The Colt historical department told me the other day that they had seen some from this period that were not stamped with it, however, I've been told by some "experts" all were....I'm at a loss and don't know what to believe! Any help would be appreciated....