I have this thing for 1911 .45's.
Top left: pre Series 70 Colt Commander; Bottom left: Series 70 MKIV Gold Cup
Top right: Colt Double Eagle; Bottom right: Springfield Armory 1911A1, with some mods done to her.
Nice collection! I don't have any 1911's. My dad inherited an old US Army 1911, manufactured by Singer, I think. I know it's not a Colt manufacture.
My grandpa carried it religiously when he was fishing and digging ginseng. It's no safequeen.
Edited: Only 500 Singer manufactured were made. I'll bet it's NOT one of those! And seems like I remember it being a typewriter maker, so probably Remington Rand.