He told me both guns were very tight, mechanically perfect, and had perfect bores! The price for the pair was crazy low I thought, so told him I'd trust his judgement. He called me yesterday and said he'd offered them $200 less for the pair and they accepted his offer! So I jumped in my car and headed to his house!
Turned out to be 1867 conversion pistols, which were built from reworked 1865 Remingtons that were .50RF and changed to .50 Navy CF! There were 6500 rimfires purchased by the Navy, and a year later they wanted them changed to CF. So it took 6 years for the Navy to round up just over 6350 of the pistols, and get them converted.
Remington swapped breech blocks, but also installed a new lower tang and trigger so these guns had a trigger guard the 1865 didn't have. The two he picked up for us have what looks like unfired bores, as they're both perfect! The one I got is in the 3300 serial range and has Edward Barrett's "EB" stamp on the barrel, along with the Navy anchor. Barrett only inspected 8% of these guns, so his stamp is rare to find among the 4 inspectors who marked them. It also has the FCW and P stamps all had, which are Frank C Warren (Rem. inspector) and P for proof tested.
They shoot the Navy straight wall cases, where the Army versions fired a slightly bottlenecked case with larger base diameter. These miniature .50's for the Navy can be built from .50-70 cases, or .56 Spencer cases. I built one dummy case using a beat up .50-140 case I had. But too much work and cost to build many.




Case is .86" long and uses a 290-300 gr. bullet, with 25 grs. of 2f.