Hi Cees,thanks for the response.
It's kind of funny that you mentioned the glass factory in Holland that has made glass marbles.
Here's what I know about it:A close friend of me,told me that he went with his father in the 50s to a glass factory to buy marbles.
You see his father was an artist who made sculptures of pottery,sometimes he used glass for his objects,he melt the marbles.
The funny thing is:this glass-factory was located 100 yards from where i live in Amsterdam.
The adress was:Realengracht 20 Amsterdam.
The name of the factory was:Veiligglas N.V.
In a local newspaper the son of the factory's owner has confirmed that marbles were made in the factory.
At that time the son was too young (the 50s)to remind himself much more.
Till now i've not done enough research about the whole thing,I still don't know what kind of marbles were made there.
When I know something more I'll let you know.
The building doesn't excist anymore,new appartements are build at that place.
Here's a picture that was add by that interview,where the factory was located.
Wanna dig there?LOL
winnie