Lo and behold! That 45 is one of the fraudulent ones. A 1911 from World War II did not originally have micro adjustable sights or an elevated front target sight. This gun was probably just stolen from the US by a GI and then accurized for target shooting. Judging by the sights, the work looks like it was probably done in the 1960s. $5100!?! There is a sucker born every minute. With alterations like that, it shouldn't be worth much to a collector unless, perhaps, it belonged to John Wayne, a popular U.S. President, or somebody of similar status.
Please correct me if I'm wrong.