They had more marbles in their May auction, and I thought they sold well.
I did a search and it looks like (roughly) 150 of the 711 lots are CA. Not as many as it looks (in my mind)!
I'm guessing your the lucky owner of Collection no. 3, from the Netherlands?
http://www.glasmurmeln.com/HOT--ar--ar--Sammler-zeigen-ihre-sch.oe.nsten-Murmeln-_-Collectors-show-their-nicest-marbles.htm
Here's some examples of similar marbles. Notice the pontils.
http://www.liveauctioneers.com/item/4539928
http://www.auctionflex.com/showlot.ap?co=31120&weiid=8526828〈=En
http://www.auctionflex.com/showlot.ap?co=31120&weiid=8527227〈=En
Where did it say that early US marbles were Clambroths and that English colored marbles were made in England? I'm reading from my phone, so I don't think I'm able to open all the links.