Lord Dunsany, the Anglo-Irish writer of weird fiction, employed a number of wax seals of his own design in the early twentieth century. They are all strange and whimsical. Douglas A. Anderson recently posted photographs of half a dozen or so at A Shiver in the Archives. See two examples above.
Another interesting seal used by Dunsany appears on a letter he wrote in 1918. He had drafted a playful warrant, or certificate, admitting his cousin Mary into “The Most Singular Order of the Crocodile and Cart.” It is sealed with a caricature of Dunsany in profile with the epithet “Edvardus Avunculus.” He refers to it as his Avuncular Seal.