Why would one collect First Day Covers?
Many stamp collectors and stamp dealers collect mint (uncancelled) stamps. Some collect First Day Covers (FDC’s). Others may collect both. However, a stamp cancelled with the official First Day of Issue cancel has the special significance of having the issue date and the city, state, and zip code of the issuing city, along with the words “FIRST DAY OF ISSUE”. Collecting First Day Covers is a hobby for anyone who loves stamps!