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. 13 shown for “Canton China opium trade stampless cover” — 46 records examined, 33 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.
Chinese Palampore
Artist not stated in the record · 1750–1800
Canton China opium trade stampless cover
Artist not stated in the record · April 20, 1853
Tureen with cover (part of a service)
Artist not stated in the record · early 19th century
Official stampless cover with photostat on album page
Artist not stated in the record · June 23, 1948
Self-Portrait
George Chinnery · 1825–28
Postage Paid stampless cover on album page
Artist not stated in the record · October 1, 1947
Pair-case quarter-repeating watch
John Champion · ca. 1770–72
Postage Paid stampless cover on album page
Artist not stated in the record · June 20, 1946
![[After the Capture of the Taku Forts], by Felice Beato](/_next/image?url=https%3A%2F%2Fimages.metmuseum.org%2FCRDImages%2Fph%2Fweb-large%2FDP137206.jpg&w=3840&q=75)
[After the Capture of the Taku Forts]
Felice Beato · 1860
Gaza to Cario stampless cover with cancels on album page
Artist not stated in the record · 6/6/1919
The Horse Fair
Rosa Bonheur · 1852–55
Postage Paid stampless cover and photostats on album page
Artist not stated in the record · October 14, 1939
Official stampless special delivery cover on album page
Artist not stated in the record · April 7, 1949
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. 6 matched · 6 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.6 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 244723 matched · 40 examined · 33 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.7 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.