FIE, PR, and GB
I posted this same information on a thread that Fingers started but it seems to be appropriate here as well.
That GB marking is one that I have also have been trying to identify for many years. Along with the PR marking it is one of the most elusive markings around. Several have speculated what it is but no actual documentation.
I recently picked up an 1851 Army (Navy but .44cal.) with steel case hardened frame on Gun Broker with three different length barrels, 12”, 7 ½”, and 5”. The barrels all have the same serial number as the revolver. EMF sold these back in the early 1980’s as a set. I have a copy of their ad for this revolver set from an old Gun List, November, 1980. It has the Italian proof marks and the “PR” marking on the butt and that is all. This indicates to me that “PR” was an Italian manufacturer and not an importer/distributor marking.
A while back I ask Boyd Davis, founder of EMF, about this set. He did not remember having it in their inventory but wasn’t surprised that EMF may have offered it. It was part of the “one up man ship" game that all the importers/distributors were involved in, in order to compete in the late 1970’s-80’s. It was EMF and Navy Arms who also offered the 3rd Model Dragoon with the 18” barrel, shoulder stock, and holster.
I had this three barrel set on a list that I keep of items known to exist but did not expect to ever see because of its’ uniqueness and rarity. I thought this of the 18” barrel Dragoons as well but have since run across only five of these in 17yrs. RPRCA has three of these in its collection. Who knows how long it may be before another three barrel set, completely in tact may again appear.