Indeed Dutch pseudo marks. According the Red Citroen Valse Zilvermerken in Nederland.
Crowned H above dot, pseudo year letter #129, seen on spoons, used by silversmiths in Groningen en Schoonhoven.
Q in round shield, pseudo year letter #295, seen on spoons, used by silversmiths in Friesland and Groningen.
HS in monogram/conjoined, pseudo maker's mark # 145, used by silversmiths in Groningen.
Made around turn of the 19th century-early 20th century
See pseudo marks used in Groningen, Douwe de Jong could be the maker of your spoon but.....
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Peter