In 1991 the Antwerp based book fair called Boekenbeurs in collaboration with the Belgian Post launched an envelope and stamp holding 'Cori Le Moussaillon', and this to promote the youth philately. Whereas the stamp is widely known, the drawing on the envelope is less known (to some extent). [caption id="attachment_1137" align="alignleft" width="212"] The detail on the envelope, the print quality