Added better photos and some more description:
In my OP I mentioned the number #671 which I've found appears on othr parts: side plate, trigger guard, trigger, hammer and on the edge of the cylinder.
#2236 is stamped on the bottom of the barrell
#1586 is stamped adjacent to the mechanism that flips outwards allowing access to the cylinder.
Also there is a stampimg or proof mark that looks like a crown with an inverted U directly underneath it.
Getter a closer idea of the make and model of this revolver would fantastic. Trying to track down who "CA" was with 12 notches to his name is proving to be very difficult.
I also want to mention that (won't add to identification process) that the hammer will not "cock" and there is a screw missing that acts as a pivot for the trigger.