Are First Day Covers worth collecting?

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

Philately | First Day Covers (FDC's) | GREAT BRITAIN PART-1 (1964-1982) |Vintage | Hobby

1977 First Day Cover Stamps #philately #stamps #FDC

FIRST DAY COVERS: TYPES AND HOW TO ORGANIZE THEM

VICTORY STAMPS First Day Cover | Meron ka ba nito?

35 British First Day Covers (London Issue) from 1965 to 1977 in a Album 35 FDC's **SOLD**

Colorano Silk First Day Cover Album

Signed First Day Covers; Babe Ruth, Walter Johnson. EPISODE 13

George 5th Postal Covers | 1915 to 1938 | British India | Postal History | Collection | Hobby

Lot of First Day Issue stamps/envelopes

world's rarest British colony stamped, slouganed marked first day cover stamps collection album

First Day Cover

American Postal First Day Covers from 1950's to 60's Part 4

STAMP AUCTION UK 05.02.22 LOT 420 GB MISC FDC'S. AUCTION ESTIMATE £440.

Huge First Day Cover Collection in Large Stamford Cover Album (88 Covers)

First Day Cover featuring Concorde #philately #stampcollecting

Diamond Jubilee First Day Cover & Diamond Jubilee Definitives & Diamond Jubilee Pictorials Stamps

GB First Day Cover Collection 55357

1998 The New British £2 Pounds Coin Cover - First Day Cover Mercury UK