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 “1c Documentary Proprietary revenue stamp with fancy cancel single” — 40 records examined, 1 dropped by the rights gate.
Archives queried 2026-09-01 01:31 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.
1c Documentary Proprietary revenue stamp with fancy cancel single
Artist not stated in the record · 1862
1c Documentary Proprietary, 2c Documentary Bank Check singles on photograph
Artist not stated in the record · 1864-1866
1c Proprietary revenue stamp trial color proof
Joseph R. Carpenter, American · 1871
6c Documentary Proprietary revenue stamp approved die proof
Artist not stated in the record · 1871
1c United States Proprietary Medicine Company wrapper revenue stamp single
Artist not stated in the record · 1864
1c United States Proprietary Medicine Company wrapper revenue stamp single
Artist not stated in the record · 1864
1c Arnold & Co. revenue stamp single
Artist not stated in the record · 1872
3c Documentary Proprietary revenue stamp single on photograph
Artist not stated in the record · c. 1865
$200 Documentary Second Issue revenue stamp die proof single
Artist not stated in the record · 1871
$200 Documentary Internal Revenue revenue stamp single
Artist not stated in the record · 1862
50c Documentary Second Issue revenue stamp invert strip of five
Artist not stated in the record · 1871-1872
$500 Documentary Second Issue Persian Rug revenue stamp die proof
Joseph R. Carpenter, American · 1871
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. 261308 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 2026-09-01 01:31 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.