HelloAttachment 27404Attachment 27405

Hi, I recently purchased this 1861 Remington Navy pistol, but I cannot get it to fit into any clean catagory that I have researched (hope the pics came out on this, if not i will try again).
Most perplexing is the cylinder arbor, it has no wings, and neither the loading lever or the front of the frame has a cut out to accept a winged arbor; I have not seen any like this. Also, the caliber should be .36, but seems more like .38. The barrel has the two Patented 1861, Remington Illion new York stamping. The loading lever is grooved and cut so that the cylinder could be removed without lowering the loading lever. Four digit serial number is 1859 under barrel, but could have a 5th digit under cylinder arbor, but I cannot remove it. As well, the cylinder will not revolve on the arbor, although the rest of the gun functions and is not really very rusty, soaking it now. Barrel measures 7 and 3/8 inches, and the exposed threads are noted. Anyway, it all seems early model except for the exposed cylinder threads, but the caliber and the non winged arbor pin makes no sense. Any help appreciated.
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