Oh this is so much fun,in a sort of bad time for me.
I,ve mailed with Hans Ziekenoppasser and he has send me 18 pictures of the marbles,made by veiligglas in Amsterdam,thanks so much.
And yes these are the marbles i've found frequently here,and i was always thinking they were made in Germany,isn't that funny?
Here are a few of the pic-.
winnie