Are First Day Covers worth collecting?

WHAT IS A FIRST DAY COVER? AND WHAT ARE THE PARTS OF A FIRST DAY COVER?

Let’s talk about first day covers

1977 First Day Cover Stamps #philately #stamps #FDC

Abandoned in Storage LP First Day Covers Stamps Collection Noritake Tiara English Crockery Collecta

My First Day Cover Collection

Collectable Covers & Postcards

First Day Issue (FDC) Covers, Postal Cards Special Covers Collection - Part 1

1979 Year of the Child First Day Covers #philately #FDC #stamps

Episode 42: First Day Covers

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

Stamp Sleuth - Wildlife First Day Covers

Philately | First Day Covers | United States - Part 1 | 1938 - 1957 | Hobbies | Collection | Vintage

Colorano Silk First Day Cover Album

Philately | First Day Covers (FDC's) | Australia | Part - 1 (1974 -1984) | Vintage | Hobbies

Maxicards and FDCs (First Day Covers!)

Buckingham Covers 'Collecting First Day Covers?' vs Royal Mail Stamps FDC

Queen Elizabeth II Stamps, First Day Cover, post card, Stamps with postal marks

Philately | First Day Covers (FDC's) | Switzerland | Hobbies | Collection

FIRST DAY COVERS: TYPES AND HOW TO ORGANIZE THEM