While Francois Fournier was a philatelic facsimile maker whose work fools only novices or collectors who have never seen the real thing, Jean de Sperati spent his life creating forgeries designed to undermine the most knowledgeable philatelists. Even his book that he wrote Philatelie sans Experts (Philately without Experts) shows his prime motivation was the thrill of creating forgeries that even great experts couldn't tell. And Sperati's work is good, so good, in fact that until about 1920, when it became known that he was doing forgeries, stamps that he made in his workshop would routinely get certificates of genuineness from the most prestigious certifying boards. Sperati's work was a passion. He engraved his stamps from scratch