Dutch silver bag bracket, unknown maker?

[Vantlicht]

This nice silver item with the history of israel in the sinai dessert is marked with a for me unknown hallmark.
We can help me with the maker?

[oel]

On your last image we see the Minerva head with regional assay office letter M for Schoonhoven. There should be some marks, standard mark and year letter? The maker's mark is indecipherable.
For the Dutch (hall)marks see;
https://www.925-1000.com/forum/viewtopic.php?t=32028

Peter