I'm attaching photos of two Civil War period holsters for Colt M1851 Navy revolvers. The holster on the right in the front view is an Army issue holster made by I. J. PITTMAN of NYC or Newark, NJ. This is the standard issue Army holster of the mid-war time period with 3 copper rivets and 2 rows of stitching holding the belt loop to the holster (as seen in the back view). An earlier version had only two rivets. Although many people identify this model holster as being for the M1860 Army revolver -- this one is too short for the 8" barrel of the M1860 and was made to only fit the M1851 Navy with it's 7 1/2" barrel.
The holster on the left in the front view is a private purchase holster of pigskin and holsters of this type were purchased by officers and civilians. The Colt 1851 Navy model revolver was actually used by large numbers of federal cavalry troopers particularly early in the war before production of the .44 cal. M1860 Army revolver caught up with demands and officers and some state units purchased large numbers of M1851 Navies. The loops on holsters sold privately usually have much lighter duty belt loops as seen in the back view. Many were worn on the western frontier.
Since the Colt M1851 Navy revolver was made as late as 1873, many of the civilian holsters post-date the Civil War and there is really no way to conclusively date them. Yours was certainly made for the M1851 Navy but is not an Army issue piece. It appears to have been machine stitched along the edge which could date it later. Are there any ink stamps inside like "WCC" as Western Costume Company made a lot of holsters for western movies in the 1950's and I've owned one of these.
Your other holster might fit my WWI Webley revolver and I would be interested in buying it if possible. There are two small holes in the flap which means someone at some time attached a long leather tab to it. Originally, the tab was much shorter and stitched to the holster body on the back side.
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