Your model is either a Pietta (marked on the side of the barrel) or an Uberti (marked under the loading lever).
It is true that the gun might be either of those manufacturer's products... You might have an A.S.M. (Armi San Marco) manufactured gun. You may even have one of the actual COLT contracted guns that were made by the Italians, but are considered to be "genuine Colt guns" and are valued much higher than the other brands.
If you can, try to get some more information off of the barrel ,usually in plain sight--BUT sometimes you have to lower the loading lever and the info is stamped on the bottom of the barrel instead.
It is correct though that most "factory manuals" that came with these guns offer very little technical info. I suspect that they figure the buyer is already aware of the loading/firing/cleaning procedures involved with the cap-n-ball revolver.
There are a variety of sources for more technical information, but once you understand the basics, it's pretty easy... (at least I have always thought so). I grew up watching too many "westerns" I guess... The Lyman Black Powder Handbook isn't the best, but it will get you started.
"The door is always open".
ALWAYS use a BIG enough gun, or use TWO smaller ones...
WV_Hillbilly
PS I just noticed I got "promoted to .45 caliber" with my 500th post.