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 “Union Prisoner-of-War Cover” — 64 records examined, 16 dropped by the rights gate.
Archives queried 2026-09-01 01:09 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
Union Prisoner-of-War Cover
Artist not stated in the record · October 23, 1863
Partial tea set (teapot, sugar bowl, cream pitcher, slop bowl)
Union Porcelain Works · 1876
Union prisoner of war cover
Artist not stated in the record · May 22, 1865
Jardinière
Union Porcelain Works · 1876
Union Prisoner-of-War Cover
Artist not stated in the record · 1864
Pilgrim vase
Union Porcelain Works · 1876
Union Prisoner-of-War Cover
Artist not stated in the record · 1864
The Cloisters Apocalypse
Artist not stated in the record · ca. 1330
Union Prisoner-of-War Cover
Artist not stated in the record · 1864
Goblet and Cover (?)
Artist not stated in the record · 700s
Union prisoner of war cover
Artist not stated in the record · May 12, 1865
Union Pipe
J. Sharp · early 19th century
Union prisoner of war cover
Artist not stated in the record · Oct. 26, 1864
Album of Tournaments and Parades in Nuremberg
Artist not stated in the record · late 16th–mid-17th century
WWII German POW free mail post card
Artist not stated in the record · October 16, 1943
Prisoners from the Front
Winslow Homer · 1866
Confederate Prisoner-of-War Cover
Artist not stated in the record · Postmark: April 16, 1863
A Collection of Etchings and Engravings in Imitation of Drawings from Various Old Masters, Being Facsimiles of Their Respective Performances, Chiefly by Arthur Pond, & Charles Knapton, London 1734 &c,
Arthur Pond · 1732–69
Cover
Artist not stated in the record · c. 1944
Photographic Views of Sherman's Campaign
George N. Barnard · 1860s
Prisoner of war air letter sheet
Artist not stated in the record · 1939-1945
Covered Vegetable Dish
Union Porcelain Works · 1885
Prisoner of war air letter sheet
Artist not stated in the record · 1939-1945
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. 796 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. 4854 matched · 40 examined · 9 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 2026-09-01 01:09 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.