Louis,
Allen wrote that the serial number is 177078, your guess (117078)was for a revolver 60,000 earlier. You may want to check your sources. This model was manufactured in 1850 around serial#12000 and ending in 1873 around #340000. Barrel lengths started with the 3" (collector named "Wells Fargo"model without loading lever) and generally included 4,5, and 6"lengths. There were variations so I would not count out an additional 1/2" on any of the above lengths.
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Rich
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