# First day of issue

> first day on which a stamp is sold at a country's post office counters

**Wikidata**: [Q126616154](https://www.wikidata.org/wiki/Q126616154)  
**Source**: https://4ort.xyz/entity/first-day-of-issue-q126616154


## References

1. Großes Lexikon der Philatelie (2 ed.)
2. Lexikon der Philatelie (5 ed.)