Hi, Mike,
The gun collectors call the Open Top Pocket Model Revolver, or "Old Line", was made only in .22. As far as I can determine, Colt called it "Colt's Breech Loading Seven Shot Revolving Pistol" so it is easy to see why it got a shorter name. There were two versions, of which that is the first.
The "New Line", which was Colt's term (in full - "Colt's New Line Breech Loading Revolving Pistol"), had a top strap and a fluted cylinder with notches at the rear. There were several slightly different versions because of the caliber; they were made in .22, .30, .32, .38 and .41 rimfire and .32, .38., and .41 center fire. The .22 was seven shot, the others 5.
Jim
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