First Day Covers are envelopes affixed with a newly issued postage stamp or
stamps and bearing the postmark of the first day of issue and an officially
chosen place of issue made available for sale to the public.

For more videos about first day covers click on the links given below:

1) Philately | Aerophilately | First Flight Covers | Lufthansa German Airlines | Hobbies | Collection
-https://youtu.be/SobpoIGPk8g

2) First Day Covers | 45 Different Countries | Philately | Hobbies | Collection | Vintage
-https://youtu.be/_nt4Bq9hUUA

3) 76 different Indian First Day Covers (1962-1975) | Hobbies | Collection

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