Hi Thomas,
Dear me, you had me going but my final verdict; made in Holland. And yes city of Schoonhoven, again! Although deformed and not complete the town mark for Schoonhoven used around the end of the 18th century, 1779-1785. Unfortunately no year letter to confirm which is not unusual for light weight silver, especially during time of turmoil, like the French occupation of the Netherlands. The Schoonhoven silversmiths never took assay obligations too serious.

The maker's mark looks like a hand for (contributed to); Gijsbert Lameer born in 1755 and registered as silversmith from 1779-1811 (died). I have forwarded your images to the conservator of the Zilvermuseum Schoonhoven for a final verdict, will keep you informed.
Best,
Peter