Hi Elena,
Marks of the Southern Netherlands 1814-1831
After the defeat of Napoleon and the French supervisors left, Belgian people under Dutch supervision from 1814-1832.
E for étranger=foreign, used on small work re-assay mark 1814- till 4th June 1817
The other two marks could be French for small silver work minimum 800 fineness used without assay office mark 1798-1809
See:
http://www.925-1000.com/Ffrench_marks.html
Best,
Peter