Question

what is a fist day cover​

Answer 1

Answer:

an envelope bearing a stamp or set of stamps postmarked on their day of issue.

Answer 2

A first day of issue cover or first day cover 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. Sometimes the issue is made from a temporary or permanent foreign or overseas office.

DEFINITION

an envelope bearing a stamp or set of stamps postmarked on their day of issue.