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. 15 shown for “75c triple letter rate for more than 400 miles stampless cover” — 43 records examined, 0 dropped by the rights gate.
Archives queried 2026-08-31 23:38 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 Harvesters
Pieter Bruegel the Elder · 1565
75c triple letter rate for more than 400 miles stampless cover
Artist not stated in the record · c. 1816-1845
Derick Berck of Cologne
Hans Holbein the Younger · 1536
Stampless Cover
Artist not stated in the record · 1844
View of Toledo
El Greco (Domenikos Theotokopoulos) · ca. 1599–1600
25c single letter rate more than 400 miles Arkansas Territory stampless cover
Artist not stated in the record · March 3, 1832
Stampless Cover
Artist not stated in the record · 1826
Stampless Cover
Artist not stated in the record · 1850
Stampless Cover
Artist not stated in the record · 1846
Stampless Cover
Artist not stated in the record · c. 1850
Stampless Cover
Artist not stated in the record · 1828
Stampless Cover
Artist not stated in the record · 1826
Stampless Cover
Artist not stated in the record · 1851
Stampless Cover
Artist not stated in the record · 1847
letter from Arkansas Territory stampless cover
Artist not stated in the record · March 3, 1832
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. 3 matched · 3 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.3 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 7347717 matched · 40 examined · 0 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 23:38 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.