Help with Dutch marks 1790's ?
The OP has received link to Dutch (hall)mark topic, herewith again;
http://www.925-1000.com/forum/viewtopic.php?f=5&t=32028
http://www.925-1000.com/forum/viewtopic ... 664#p95664
OP has shown us Dutch pseudo marks before and again.
Bottom left; C pseudo year letter, pseudo maker's mark, pseudo standard/fineness mark, pseudo maker's mark.
This particular row of pseudo marks could have been applied by silver factory located in Groningen or Schoonhoven and made around turn 19th century.
Oel.
Reference; Valse Zilvermerken in Nederland K.A. Citroen