It could be the town mark of the Dutch city of Roermond, in the province of Limburg, the Burgundy Lily or fleur-de-lys(French lily) https://en.wikipedia.org/wiki/Roermond.
Your spoon, double-drop, unclear maker's mark The silver guild of Roermond used lot standard minimum 13 lot (812/000), maker's mark and the town mark (lily) only. No year letters were used. Below 13 lot, maker's mark only, without town mark.
Some examples of silver spoons, double-drop, Roermond 2nd half 18th century;
Peter.
Source; Roermonds Zilver Gemeente Museum Roermond mr. W.E.S. l. Keyser-Schuurman 1982, pagina 10,11,47,69