Colt made the 1849 pocket and wells fargo, they are the same gun, the former has a loading lever, the latter doesn't
Colt made the 1851 as an all steel gun. The brass reproductions that you see mimic those that were made by various companies in the south. They were all .36 caliber. There are rumors that .44 was tested by Colt or these other southern manufacturers but no real proof and not many were made if they were. Not knockin the .44s, they shoot great
The 1860 was made by Colt. Great gun.
The 1861 was made by Colt. Basically the same gun as the 1851 with the sleek barrel assembly design of the 1860.
1862 pocket police and pocket navy were made by Colt. They used the frame from the 1849 pocket and switched to five shots at .36 Pietta makes a nonrealistic repro of this gun. Their model is a short barrel 1861. Uberti makes real reproductions of this gun. They make the guns that Taylors and Cimmaron sell also.