CA21-027, 2021, Snow Mammals, First Day of Issue, Pictorial Postmark, Northern

Description

CA21-027, 2021, Snow Mammals, First Day of Issue, Pictorial Postmark, Northern Collared Lemming
What is a first day cover:
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. Sometimes the issue is made from a temporary or permanent foreign or overseas office. There will usually be a first day of issue postmark, frequently a pictorial cancellation, indicating the city and date where the item was first issued, and "first day of issue" is often used to refer to this postmark. Depending on the policy of the nation issuing the stamp, official first day postmarks may sometimes be applied to covers weeks or months after the date indicated.