"De Bezige Bij"
The publishing-house is founded in 1944 during World War II by resistance fighters from Amsterdam. One of the resistance men - called Geert Lubberhuizen - had code names like Bas Ruijs.
One day Lubberhuizen left a note at an adress in Amsterdam. He signed the note with "Bas (busy)". A woman of the resistance group made of it: "Bas busy as a bee can be." That led to "The Busy Bee" and later - in the Dutch language - to "De Bezige Bij".
The Publishing house still exist. If you want a machine franking stamp. The adress is:
De Bezige Bij
Van Miereveldstraat 1
NL 1071 DW Amsterdam
by Jan de Crom
taken from "The Postal Bee" 1/1998
Contact Group Bee Philately