Your link has done the same as mine Christine...gone to the Home page. I see now that you have to select 'Verkoop', then the blue writing that says 'Glas en Kristal', then scroll down a few pieces until you come to the blue honeypot which I think is the same as yours Paul.
Ivo, do you by any chance happen to know if the yellow geometric design by Berlage was made with Colopal?