Hi Anto,
Silver Gravy/Sauce Boat, double-lipped with two loop handles and over-struck marks.
Nice find and yes, Belgian silver guild marks, two town mark; a Castle Tower with 6 battlements (6 dots) (overstruck) for the Belgian city of Bergen, in French called Mons, together with the other city mark
AE(conjoined) crowned (overstruck). Year-letter
69 for
1769.
https://en.wikipedia.org/wiki/Monshttp://www.divaantwerp.be/nl/collection ... ergen-1765http://www.divaantwerp.be/nl/collection ... ie/s7584#0http://www.divaantwerp.be/nl/collection ... ie/s7582#0http://www.divaantwerp.be/nl/collection ... ctie/s5520Maker's mark
AP, at the moment without my reference books but I believe it to be an unidentified maker's mark. Will double check after the 19th of December and confirm.
The zig zag mark; Assaying by tremulierstrich or silver removal. See;
viewtopic.php?f=61&t=48537&p=146547&hilit=zig+zag#p146547Best,
Peter