Postby blakstone » Fri Oct 11, 2013 12:39 am
Just to clear up a few things, this particular "papal tiara & keys" mark was created 7 Jan 1815 by edict of Cardinal Bartolomo Pacca, who abolished the Napoleonic French silver standards and returned Rome to the “carlino” standard of 10 oz. 16d. (.889), with a "high" standard of 11 oz. 9 d. (.948), indicated by a "wolf" mark. The Roman law was extended to the rest of the Papal States on 25 July 1817, and the marks remained in force until 1870, when Rome was assumed into the Kingdom of Italy.
"F13G" is indeed the mark of Filippo Grimaldi (1782-1848; Master 28 Aug 1803), but it was also used after his death by his son, Gaetano Grimaldi (born 1805) who continued the shop until at least 1869. The shop was located in Rome, on via del Pellegrino, not in Frosinone, so I'm wondering if the "C" is merely a trick of the light; there was no assay office letter for Rome. "C" was the mark for the assay office in Frosinone, though, which opened in November 1824.
Hope his helps!
Ref: Anna Bulgari Calissoni, Maestri Argentieri, Gemmari e Orafi di Roma (Rome: Fratelli Palombi, 1987), pp.241-242, marks 596-597.