Hello from the great state of Alabama! I purchased this as a 1911A1 and discovered I had not looked closely enough to the frame markings. It has correct markings for a Union Switch and Signal frame but the serial number looks odd and is out of range as US&S started at 1041405. As you can see mine is in the 900,000 range. Another marking that is odd is the M1911A1 US ARMY. It is a different font that what almost all other 1911A1's have. The only thing that appears correct is the US Property stamp. However, RCD inside a circle is correct for Robert C. Downie as the Army Inspector for US&S for the entire run. The slide is a WW2 Colt with a "P" proof mark just in front of the rear sight I believe this receiver is a fake but am puzzled as to why someone would go to the trouble to fake it? Don't worry, I did not pay a premium or near what it would have been worth if it were a true US&S frame. Anyone have any idea as to what I have? I'll be happy to provide more photos if need be. Thanks in advance.