Hallmark of the French Empire 1809-1819, so called Fasces with the axe at the top to the right, in a fitted frame. Restricted warranty mark for small silver articles (800/1000).

The maker's mark
RI under a swan in lozenge for
Rintje de
Jong, registered in the village of Lemmer (Friesland), 1811- before 1829, active in Sneek 1807-1810.
Peter.
Source;
WaarborgHolland, Gouda 2009. Karel Citroen Dutch silversmiths marks and names prior to 1812