Boy, oh boy, large framed DA's, Colts too, the Canadian RCMP used them for quite some time also.
I also have one in .45ACP, or .45 Auto Rim, checked # & seems to built in the 1920'.
It was my grandfathers until he passed it on to my father, then down to me.
I do have a accuracy problem with it, I'm all over with it, cast or jacketed, doesn't matter, I have to spend some time using some light loads, off a rest, just to see where point of impact is, compared to point of aim , up close & work my way back to 25 yds.
Off subject, but who makes grips for old Colts ??
I also have a 1953 Dective Special, large D frame, Colt changed frame size to a smaller one, I've hit a dead end.
Thanks for the time. EK out !