Those are the pictures I remember seeing in the Wim Heesen book that was for sale at the museum (which I didn't buy but had a quick look through) and probably why the date 1967 lingered in my memory somewhere. I'm glad the photos are now added to the site.
Ivo's vase looks a little thicker than mine, but I assume that sort of variation would be normal if it were mold-blown?
Astrid