Pictured is a Colt M1911A1 that I acquired from the estate of a Korean War vet. The frame is in the 927,000 range and was made by Colt in 1943 and has brown plastic grips. The unusual part of this gun is the slide. As you can see, the slide was made by Singer. The slide was probably on a Singer made gun issued during WWII as the slide has the "P" proof mark in the top rear of the slide. The slide has been parkerized and my assumption is as follows. After WWII, the M1911A1’s were sent to an arsenal where they were refurbished and re-parkerized. (The original WWII Singer guns were all blued.) No attempt was made to match the gun to its original frame or perhaps the frame was damaged and had to be replaced. The gun was then issued to troops for the Korean War and it can home with the vet.