After years of searching, a reader from our website has produced the golden tip which has led to a fascinating conclusion.
The optiek vases under discussion were not made at Boom.
They were not made at Braine-Le-Comte either.
A recent catalogue which surfaced at a flea market clearly identifies the manufacturer as Doyen, a small factory at Havre-Ville near Mons in Belgium.
I've added the new information to the pages at
www.hogelandshoeve.nl.
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http://www.hogelandshoeve.nl/index46.html)