first-day cover
noun/ˌfɜːst deɪ ˈkʌvə(r)/
/ˌfɜːrst deɪ ˈkʌvər/
- a specially printed envelope with a stamp that has a postmark with the date that stamps of that design were first sold
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first-day cover
Definition of first-day cover noun from the Oxford Advanced Learner's Dictionary
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