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. 17 shown for “4c D.S. Barnes revenue stamp pane of 18” — 45 records examined, 2 dropped by the rights gate.
Archives queried 2026-09-06 21:42 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Rubens, Helena Fourment (1614–1673), and Their Son Frans (1633–1678)
Peter Paul Rubens · ca. 1635
4c D.S. Barnes revenue stamp pane of 18
Artist not stated in the record · 1862
Circus Sideshow (Parade de cirque)
Georges Seurat · 1887–88
2c D.S. Barnes revenue stamp pane of 27
Artist not stated in the record · 1862
Three Ceremonial Arrowheads
Artist not stated in the record · ca. 1437–39
4c Hostetter & Smith revenue stamp pane of 24
Artist not stated in the record · 1862
![[Man in Costume], by C.D. Fredricks & Co.](/_next/image?url=https%3A%2F%2Fimages.metmuseum.org%2FCRDImages%2Fph%2Fweb-large%2FDP-42457-001.jpg&w=3840&q=75)
[Man in Costume]
C.D. Fredricks & Co. · 1860s
4c John I. Brown & Son. revenue stamp sheet
Artist not stated in the record · 1862
Madame Cézanne (Hortense Fiquet, 1850–1922) in the Conservatory
Paul Cézanne · 1891
4c J.C. Ayer & Co. revenue stamp partial sheet
Artist not stated in the record · 1862
1c Herrick's Pills & Plasters revenue stamp pane
Artist not stated in the record · 1862
1c J.C. Ayer & Co. revenue stamp partial sheet
Artist not stated in the record · 1862
Revenue Stamp
Artist not stated in the record · 1851
4c Abraham Lincoln plate proof
Bureau of Engraving and Printing · May 26, 1958
4c Perry Davis and Son revenue stamp single
Artist not stated in the record · 1869
4c Moody, Michel and Company revenue stamp single
Artist not stated in the record · 1873
4c Helmbold's revenue stamp single
Artist not stated in the record · 1868
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. 5 matched · 5 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.5 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 3908563 matched · 40 examined · 2 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 2026-09-06 21:42 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.