This is one you hardly ever see. It is the maker's mark of Fabrica Armi Gradoga Successore, FAGS. What's interesting here is that Luciano Amadi, one of the founders of Armi San Paolo, who received the first imported 1851 Navy into Italy, paid for the tooling, and then presented the initial order for 250 of the 1851 revolvers to a gunsmith named Vittorio Gregorelli. Vittorio Gregorelli was also a parts supplier/manufacturer and was associated with Aldo Uberti. Coincidentally, the same Luciano Amadi that founded Armi San Paolo in 1971, along with Grassi, Dominelli and Gazzoli, were gentlemen from the recently defunct handgun manufacturer named FA Gradoga.

The stamp for Fabrica Armi Gradoga Successore is "FAGS". It seems Vittorio Gregorelli and Luciano Amadi were having parts and/or some guns made by Fabrica Armi Gradoga as well as Dominelli and Gazzoli (DG) because of their close contacts with these gentlemen, to increase the production of 1851's. And the logo stamps were different because these were subcontracted guns being built for Amadi's gun trading company in the late 60's, which was a common practice at that time. This practice was not at all unusual during the peak of the replica gun making industry in Italy.