I know of no definitive references that study the use of pocket caliber revolvers during the Civil War. There are blurbs in company and manufacturer's records about the use and sales of pocket revolvers but those are few and far between. Company I of the 9th Michigan Infantry privately purchased 10 shot Walch pocket revolvers. It met with mixed reviews. The Union Defense Committee bought 50 Colt pocket revolvers and turned them over to the New York Navy Yard. When discussing pocket revolver use during the War it's more important to remember that officers were, for the most part, required to provide their own sidearms. Martial caliber (36 & 44) revolvers were scarce and deemed heavy to carry on a daily basis. Many officers opted for pocket designs due to their smaller caliber and light weight.
If you aren't dead set on buying an original Colt pocket there are several other maker's percussion revolvers that can be considered, many of them are Colt lookalikes. The firms of Bacon, Cooper, Manhattan and Nepperhan come to mind. Although not exact copies of the Colt 1849 each followed the basic design of the Colt. The Manhattan pocket revolver even had a stagecoach holdup scene on its cylinder.
Bacon Pocket
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Cooper Pocket
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Nepperhan Pocket
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Manhattan Pocket with stagecoach scene.
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The Manhattan pictured above is inscribed on its trigger guard to H M Phelps. Phelps rank, name and unit designation are also found handwritten in faded pencil inside the right hand grip. Phelps was a white officer -- lieutenant (later captain) with the 9th USCT.
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There were literally thousands of pocket caliber revolvers used during the War. Some were very popular and many were by obscure makers, all can undoubtedly lay claim to interesting Civil War stories.