An example marked 'F. Savinelli Genova Silver 0115', courtesy Giancarlo Spadaro, who speculates perhaps the 'F.' is the initial for Fratelli (Italian for Brothers). Perhaps an early example from Achille's brother's shop in Genova (Genoa in English)? Or perhaps this is a circa 1950s example, which coincided with a latter opening of a Savinelli shop in Genova?
Only thing I've seen that even mentions an F in the stamping.