Between 1963 and 2000 a few philatelically influenced items are known produced by six users. Propaganda stamps are very collectable and have been philatelically forged&colon; a forgery of a forgery. Fred Melville, speaking philatelically, called it "one of the seven wonders of the world". Philatelically, stamp paper can be partitioned into a few large groups. Philatelically, there are several descriptive terms used to categorize watermarks. His work was commemorated philatelically on a stamp issued by Algeria in 1954.