I have a second gen colt 1851 navy with an early serial 60**. When looked up on colts serial finder it lists both 71 and 72 as the year produced. 71 says 1851 navy .36 cal, and 72 says model 1851 navy .36 second gen colt. Also, there is a letter O under the 4 digit serial on the frame. I'm...
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