I always thought it was pretty darn accurate but you'd better keep it clean. I haven't shot it in 40 years but the day I retire I might put a magazine full through it. It's a ritual, twice a year I break it down as far as possible, clean it and oil it.
1916 DWM all numbers match except the two WWII era magazines and the 1937 WaA 455 Hans Romer holster.
It's the one pistol I have that I would run into a burning building to save.