Dracula was one.
"As a special security feature, a process called ‘scrambled indicia’ was used, which overlaps symbols and images that are not seen by the naked eye when printed,” says Lera.
“The Dracula stamp has three vampire bats in the blue background, which can only be seen by a precision optical device using elongated lenses called lenticules.”
Lera suggests modeling a Dracula costume after this or the many other portrayals—a Canadian stamp honoring the 100th anniversary of Bram Stoker’s novel Dracula in 1997, a Samoan stamp from 2000 featuring the Sesame Street’s Count von Count and a British stamp from 2008 with actor Christopher Lee as Dracula commemorating the 50th anniversary of Hammer Horror Films.
For more Halloween costume ideas from the Smithsonian, click here.