The late Dr. Jim L. Davis, who created the RPRCA (Replica Percussion Revolver Collector Association) nearly two decades ago referred to revolvers of this genre as the "accidental" Schneider & Glassick, even though the revolvers were not marketed as S&G revolvers. They all had brass frames and smooth, non-engraved cylinders, and parts were made by several small obscure Italian manufacturers under the collective assortium name C.O.M. , who marketed them marked as such and also sold them to importers who put their own names on barrels and frames (Sile, FIE, et al). These revolvers were basically hand fitted using the various parts provided to the assembler. If anyone has a revolver marked C.O.M. there are no parts available, but it is collector valuable and should be relegated as a wallhanger or a safe queen.
The reason for them to exist is because they were an inexpensive alternative (for the buyer) to the 1851 Navy .36 steel frame with engraved cylinders because they were cheaper to produce. When Val Forgett (Navy Arms) first started importing Italian guns in 1959 (created to his specifications), made by Gregorelli & Uberti (G.U.), the first guns were 1851 Navy .36 steel frame/octagonal barrel revolvers. Forgett realized he could also market a less expensive .36 revolver alternative for the market using a brass frame, a part round/part octagon barrel, and a smooth cylinder. Even though it was not marketed as such, it is a replica of the Griswold & Gunnison.
The early G.U. revolvers supplied to Navy Arms (1959-1961) did not have Italian proofmarks and date codes, and that so alarmed collectors of original revolvers that the NRA would not allow Forgett/Navy Arms to advertise their wares in The American Rifleman magazine for many years.
ASM started producing revolvers in 1963, mostly supplying importers like Replica Arms El Paso Texas, and when G.U. stopped production in 1962, Navy Arms looked for other sources, primarily ASM, Uberti, Armi San Paolo, and even Pietta.
Sorry to be so long winded.
Regards,
Jim