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. 21 shown for “2c Official plate proof single” — 58 records examined, 4 dropped by the rights gate.
Archives queried 2026-08-31 22:59 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Mantel clock (pendule de chiminée)
Paul Gudin Le Jeune · clock ca. 1750, figures decorated ca. 1737/38
2c Official plate proof single
Artist not stated in the record · 1873
Six Jewel Rivers
Sakai Ōho · ca. 1839
2c Andrew Jackson plate proof single
Artist not stated in the record · 1873
Circus Sideshow (Parade de cirque)
Georges Seurat · 1887–88
2c Andrew Jackson plate proof single
Artist not stated in the record · 1873
Julius Caesar (from the Heroes Tapestries)
Artist not stated in the record · ca. 1400–1410
Antoine Laurent Lavoisier (1743–1794) and Marie Anne Lavoisier (Marie Anne Pierrette Paulze, 1758–1836)
Jacques Louis David · 1788
2c Andrew Jackson plate proof single
Artist not stated in the record · 1873
Stirrup-spout bottle with palace scene
Chimú artist(s) · 1000–1470 CE
Vessel with ritual scene
Recuay artist(s) · 200–700 CE
House model
Nayarit artist(s) · 200 BCE–300 CE
2c Washington plate proof single
American Bank Note Company · 1887
House model
Nayarit artist(s) · 200 BCE–300 CE
2c Official Mail plate proof
Bureau of Engraving and Printing
Philip IV (1605–1665), King of Spain
Velázquez (Diego Rodríguez de Silva y Velázquez) · probably 1624
2c Official Mail plate proof
Bureau of Engraving and Printing
The Spanish Singer
Edouard Manet · 1860
2c red brown Washington plate proof single
American Bank Note Company · 1883
Architectural Vessel
Artist not stated in the record · 400–600 CE
2c Jackson plate proof single
Artist not stated in the record · 1863
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. 18 matched · 18 examined · 3 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. 344214 matched · 40 examined · 1 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 22:59 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.