|Clyde J. Sarzin (1915-85) of Long Island, New York developed a method of producing cachet designs on thin sheets of metal, which
were then affixed to paper envelopes. The result is a unique and highly
attractive first day cover.
Although Sarzin created many kinds of cacheted covers (including Churchill "day of death" and "day of funeral" covers), he may be best known for his covers chronicling America's space program. The last Sarzin metallic cover appeared in 1977.