had been 40 stamps to a sheet. Prior to his work on the subject, collectors first thought the plate had 100 subjects, and then experts had decided there must have been 50 stamps to a sheet; Hatfield's efforts proved that the sheets had actually consisted of eight horizontal rows of five. Hatfield wrote The New York Postmaster's Stamp, which was published in 1921 by the Scott Stamp and Coin Company. The book discusses the plating of the stamp, and also the types of paper that may have been used to produce it: References External links Hatfield Heritage, a collection of family photographs Association of British Philatelic Societies, the Roll of Distinguished Philatelists American philatelists Signatories to the Roll of Distinguished Philatelists 1867 births 1957 deaths Businesspeople from Chicago