Finally I think we know where we looking at. My first impression turned out to be correct the spoon is Belgian.Subject to reservation.
Probably not a lion under a crown but under a fire striker for the Belgian city of Namur/Namen; The ancestral hallmark, given in 1440 by Philippe the Good, shows the Namur Lion beneath a Burgundian Fire striker.https://en.wikipedia.org/wiki/Fire_striker
The year letter crowned for Namur 1761
The maker's markNW
above a symbol (a leaf?): A variant of the master mark of Nicolas Joseph Wodon
, of which three variants are already known, or the maker's mark of another master?
Gratitude; Dr. Wim Nys | Hoofd Collectie en onderzoek DIVA, Antwerp Home of Diamonds
Source: Orfèvres Namurois van G. Poskin & Ph. Stokart (Namen, 1982)
Zilver in België Piet Baudouin, Pierre Colman en Dorsan Goethals.