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. 12 shown for “1851 Issue card plate proof envelope” — 40 records examined, 7 dropped by the rights gate.
Archives queried 2026-08-31 23:14 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.The Metropolitan Museum of Art: HTTP 403 from collectionapi.metmuseum.org. Results from the remaining archive are shown unchanged — nothing is substituted for a source that did not answer.
1851 Issue card plate proof envelope
Artist not stated in the record · 1893
1869 Issue card plate plate proof envelope
Artist not stated in the record · 1893
1870 Issue card plate proof envelope
Artist not stated in the record · 1893
1847 Issue card plate proof envelope
Artist not stated in the record · 1893
1890 Issue card plate proof envelope
Artist not stated in the record · 1893
1861 Issue card plate proof envelope
Artist not stated in the record · 1893
1c Franklin reprint cardboard plate proof pane
Artist not stated in the record · 1875
5c West Point plate proof
Bureau of Engraving and Printing
5c Magna Carta plate proof
Bureau of Engraving and Printing
1c Liberty domestic postal card
Morgan Envelope Company · 1873
1c Liberty domestic postal card
Morgan Envelope Company · 1873
1c Liberty postal card
Morgan Envelope Company · May 1873
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. HTTP 403 from collectionapi.metmuseum.org. No records from this archive are shown for this query.Unavailable - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 672141 matched · 40 examined · 7 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 23:14 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.