What do you mean by the first day cover according to the third level?
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Answer:
A first day of issue cover or first day cover (FDC) is a postage stamp on a cover, postal card or stamped envelope franked on the first day the issue is authorized for use within the country or territory of the stamp-issuing authority. it refers to an imaginary level of the Grand Central Station that take passengers to the Galesburg, Illinois. The third level on the station was a medium of escape for Charley, the narrator, from the harsh realities of modern life.M
First day covers are letters that philatelists collect. On the day when a new stamp is issued, stamp collectors buy those stamps, stick them on the letters and post them to their own address; when this letter reaches their home with the postmark and the date, they preserve it in their collection. This letter is called a first-day cover. They’re never opened. They are just preserved.