According to my hero, Mr. Charles W. Clawson, Remington Rand made the best 1911A1's in WW II. I have a 1943 and a 1945 that have not gone back to arsenal rebuild. Determining that condition requires knowing when, in serial number sequence, certain stampings were applied (before or after finish) and looking for burnishing inside the numbers/letters.
I have another RR that was redone by Springfield Armory (SA) that was one of the duplicate serial numbers from Colts encroachment into RR's SN block. Colt customer service would, and did tell me the gun was made by Colt. The dead give away, among other things: Frank Atwood (FJA) never inspected Colts.
The other intriguing item about Remington Rand is their subsidiary, General Shaver, who made magazines for their parent company's pistols. They are very distinctive and every self respecting RR pistol should have at least one.
This is the 1945 version. Remington Rand's last pistol was 2465139, so this is one of their last, and likely was never issued due to VE Day.