Home › Entities › philatelic_term › First day (of validity)

First day (of validity)

first day on which a stamp is valid or a special postmark is used
Place philatelic_term Q1362379
Press Enter · cited answer in seconds

First day (of validity)

Summary

First day (of validity) is a philatelic term[1].

Key Facts

  • First day (of validity)'s instance of is recorded as philatelic term[2].
  • First day (of validity)'s subclass of is recorded as point in time[3].
  • First day (of validity)'s subclass of is recorded as publication date[4].
  • First day (of validity)'s opposite of is recorded as last day of validity[5].
  • First day (of validity)'s facet of is recorded as first day cover[6].
  • First day (of validity)'s facet of is recorded as period of validity[7].
  • First day (of validity)'s facet of is recorded as postage stamp[8].
  • First day (of validity)'s described by source is recorded as Lexikon der Philatelie (5 ed.)[9].
  • First day (of validity)'s different from is recorded as First day of issue[10].
  • First day (of validity)'s different from is recorded as local first day of issue[11].
  • First day (of validity)'s name is recorded as Ersttag[12].
  • First day (of validity)'s Google Knowledge Graph ID is recorded as /g/121k2z7y[13].

Body

Designation and Status

First day (of validity)'s instance of is recorded as philatelic term[2].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . Lexikon der Philatelie (5 ed.). wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . Großes Lexikon der Philatelie (2 ed.). wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). First day (of validity). Retrieved May 3, 2026, from https://4ort.xyz/entity/first-day-of-validity-
MLA “First day (of validity).” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/first-day-of-validity-.
BibTeX @misc{4ortxyz_first-day-of-validity-_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{First day (of validity)}}, year = {2026}, url = {https://4ort.xyz/entity/first-day-of-validity-}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): First day (of validity) — https://4ort.xyz/entity/first-day-of-validity- (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/first-day-of-validity- · Last refreshed: