FAQ-What is the difference between a stamp cover and a First Day Cover?

In addition to collecting individual stamps, many people also specialize in collecting different forms of postal material. One form of postal material is a First Day Cover. Although interest in collecting modern First Day Covers has somewhat diminished nowadays, it is still quite popular in many circles. So, what is a First Day Cover (FDC)? What is the difference between a FDC and a regular cover?

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