This isn't just any old envelope! Fun to collect and offering a broad range of appeal, first day covers are valued for both the subject matter of the stamp and their postmark. In October of 1990, the U.S. Postal Service issued a 25¢ stamp commemorating President Dwight D. Eisenhower; these first day covers were then canceled by post offices across the United States. Envelope design may vary. Handwriting may or may not be present.