'HN' = Henry Nettleton - an inspector of the Indian Wars era.
The weapons returned were Government property, and were so-marked with a 'US' on the frame - your frame would indicate a civilian revolver - perhaps fitted with a previously-inspected cylinder.
Yours has been refinished at some point - and fairly recently, by the looks of it - and maybe that's where the military cylinder came from.
The hammers on the originals were casehardened, too - just like the frames.
Information on the military refurbishment is of no use when talking about civilian production - those were two separate operations.
The weapons returned were Government property, and were so-marked with a 'US' on the frame - your frame would indicate a civilian revolver - perhaps fitted with a previously-inspected cylinder.
Yours has been refinished at some point - and fairly recently, by the looks of it - and maybe that's where the military cylinder came from.
The hammers on the originals were casehardened, too - just like the frames.
Information on the military refurbishment is of no use when talking about civilian production - those were two separate operations.