To me it doesn't look like it's veneered all over. Looks like a green band on a black/brown base, which I don't recognize as a Vitro variation. And with it being in Holland I can't help thinking it could be a foreign marble.
Thanks Robert! I also like to reach out to sellers who look like they mean well but are just harried. Gotta remember most of them are people doing the best they can in unfamiliar territory.
I can't remember if my last marbles arrived in September or a little earlier. I received more great magazines last month -- including the June 20, 1955 Sports Illustrated with the article "Color in the Dust". (Pictured here)