Even though it looks similar to a Colt M1911, it’s actually a modified version of a Singer 1911-A1.
I don’t belive that modified version has any advantages over original besides the looks.
When this custom Singer 1911-A1 came into the game and/or how to get one? That i do not know.
Only a member from the game’s development team can answer that.
So, let’s hope the dev sees this topic and also replies here with additional information about this pistol.