OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 24 shown for “Postal rates and regulations form letter” — 64 records examined, 10 dropped by the rights gate.
Archives queried 2026-08-31 22:53 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Miniature tabard
Artist not stated in the record · 1600–1700
Postal rates and regulations form letter
Artist not stated in the record · 1838
Cassone
Artist not stated in the record · ca. 1425–50
Post Office Act of 1792 publication
Artist not stated in the record · 1792
Clock watch with astronomical dial and sundial
Jan Jansen Bockeltz · ca. 1605–10
Postmaster's bill from Philadelphia post office
Artist not stated in the record · June 5, 1773
Mirror clock
Master CR · ca. 1565–70
Stampless Cover
Artist not stated in the record · 1847
Watch
Pierre Vernede · ca. 1650
Stampless Cover
Artist not stated in the record · 1852
View of Toledo
El Greco (Domenikos Theotokopoulos) · ca. 1599–1600
Transatlantic Cover to Newport, Rhode Island
Artist not stated in the record · 1820
Juan de Pareja (ca. 1608–1670)
Velázquez (Diego Rodríguez de Silva y Velázquez) · 1650
Bonn postal letter rate chart
Artist not stated in the record · 1725
Tunic with Confronting Catfish
Artist not stated in the record · 800–850 CE
10c Washington sextuple rate cover
Rawdon, Wright, Hatch & Edson · May 23, 1849
Votive checkerboard tunic
Inca artist(s) · 1460–1626
Stampless Cover
Artist not stated in the record · 1851-55
Astronomical table clock
Jeremias Metzger · 1568
37.5c double War of 1812 letter rate for 90-150 miles forwarded stampless cover
Artist not stated in the record · 1815
Comtesse de la Châtre (Marie Charlotte Louise Perrette Aglaé Bontemps, 1762–1848)
Elisabeth Louise Vigée Le Brun · 1789
Culpeper Courthouse, Virginia from Washington, Kentucky folded letter
Artist not stated in the record · December 31, 1803
Cased Pair of Flintlock Pistols Presented to Captain Cayetano Valdés y Flores
Nicolas Noël Boutet · 1801–02
Jena letter post rate chart
Artist not stated in the record · 1748
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 34 matched · 24 examined · 5 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 1472475 matched · 40 examined · 5 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-08-31 22:53 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.