Hi Allan,
Well you drop off the forum for a couple weeks - and I just about missed out on this discussion of your old Colt percussion. I'll throw in my $ 0.02 late.
As the rest of the board has commented - It's the 1849 pocket model in .31 cal.
I have my Grandads - as I also posted in the other thread listed.
Your stage coach hold-up scene roll mark on the cylinder has held up better than mine has.
I once found a detailed description on the web of that scene and the name of the engraver that did the original work for Colt. It was a marketing feature depicting a traveler defending hismself from several bad guys with the multi shot revolver. I had to look it up because on mine it's barely visible thru the wear & patina.
I don't think mine is up for shooting - but I have seen shooting replicas of the 1849 pocket models for sale in local shops for less than $200, and considered buying one.
The serial number link you provided gave a more granular year of production figures than I have seen before. Mine falls into the 1856 production range in that chart.
Regards,
Fritz.
Here's the picture of mine: