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 “3c Washington on Union cover” — 64 records examined, 7 dropped by the rights gate.
Archives queried 2026-08-31 23:04 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Century Vase
Karl L. H. Müller · 1877
3c Washington on Union cover
Artist not stated in the record · 1862
Cover
Artist not stated in the record · 16th–17th century
3c Washington Union patriotic cover
Artist not stated in the record · 1861-1863
Saint John on Patmos
Hans Baldung (called Hans Baldung Grien) · ca. 1511
3c Washington on Confederate Civil War Patriotic cover
Artist not stated in the record · 1861-1865
The Life of the Virgin
Adriaen Isenbrant · after 1521
3c Washington single on Confederate cover
Artist not stated in the record · May 2, 1861
The Rest on the Flight into Egypt
Gerard David · ca. 1512–15
3c Washington single on cover
Artist not stated in the record · 1861
Merry Company on a Terrace
Jan Steen · ca. 1670
3c Washington Treasury Department cover
Artist not stated in the record · Aug 11, 1875
Study for "A Sunday on La Grande Jatte"
Georges Seurat · 1884
3c Washington Treasury Department cover front
Artist not stated in the record · 1873
Boating
Edouard Manet · 1874
3c Washington D Grill cover
Artist not stated in the record · April 6, 1868
Teakettle and spirit lamp with stand
Paul de Lamerie · 1744/45
3c Washington Executive cover
Artist not stated in the record · June 25, 1877
Shield cover
Chimú artist(s) · 1350–1470 CE
3c Washington on cross border to Canada and forwarded internally cover
Artist not stated in the record · August 4, 1855
Shield cover
Chimú artist(s) · 1350–1470 CE
3c Washington on Hunter's Express cover
Artist not stated in the record · 1852-1857
The Third-Class Carriage
Honoré Daumier · 1864
3c Washington with Teese & Co. Penny Post local stamp on cover
Artist not stated in the record · c. 1852
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. 561 matched · 24 examined · 7 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. 1132305 matched · 40 examined · 0 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 23:04 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.