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First Day Covers are specialized envelopes that have been postmarked on the first day a new stamp design has been made available by the postal service. They are often sought after by collectors as they represent a unique piece of history, showcasing both the design and issuance date of a particular stamp. First Day Covers can come in various forms, from simple envelopes with the stamp affixed to more elaborate presentations that include cachets, cancellations, or other related materials. The cachet is often a special design or illustration created specifically for the cover and relates to the theme of the stamp. Collectors may focus on specific themes, such as animals, historical events, or famous figures, and seek out First Day Covers that match their interests. Over time, these covers can become valuable collectibles, particularly if they are in good condition and have a rare or desirable cachet.