# first day sheet

> sheet issued by a postal administration with at least one stamp affixed to the front, cancelled by a first day issue postmark

**Wikidata**: [Q1362387](https://www.wikidata.org/wiki/Q1362387)  
**Source**: https://4ort.xyz/entity/first-day-sheet


## References

1. Großes Lexikon der Philatelie (2 ed.)
2. Michel Valuable Stamps of the World – Wertvolle Briefmarken aus aller Welt (1 ed.)