![Image](https://imagizer.imageshack.com/v2/800x600q90/924/Bu89a4.jpg)
Not Dutch, believe it to be Danish, The Three Tower mark for Copenhagen, the year 1719.
See:
https://www.925-1000.com/dm_Assay.html
CLMW, the assayers mark for:
Conrad
Ludolf
Münz
Wardein, active in Copenhagen, 1679-1729.
https://en.wikipedia.org/wiki/M%C3%BCnzwardein
The maker's mark
DB 1719 for;
David Buur, active in Copenhagen, 1708-1731.
The last mark Zodiac sign Libra for the month September.
On the 2nd image (not showed), the figures; 13 1/3
Lot for silver minimum around 833/1000 fineness.
For the Lot system for silver see:
https://www.925-1000.com/Fgerman_marks_b1884.html
I will move you to the Nordic section.
Peter.
Source; Marc Rosenberg Der Goldschmiede Merkzeichen IV. Band/Ausland und Byzanz Berlin 1928