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 “Transatlantic cover to Selkirk, Scotland” — 45 records examined, 13 dropped by the rights gate.
Archives queried 2026-09-01 00:54 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
A Maid Asleep
Johannes Vermeer · ca. 1656–57
Transatlantic cover to Selkirk, Scotland
Artist not stated in the record · 1857
Don Gaspar de Guzmán (1587–1645), Count-Duke of Olivares
Juan Bautista Martínez del Mazo · ca. 1636 or later
Transatlantic cover to London, England
Artist not stated in the record · 1806
Interior with a Young Couple
Pieter de Hooch · probably ca. 1662–65
Letter from inside Charles Lindbergh transatlantic flight cover
Artist not stated in the record · May 16, 1927
The Standard Bearer (probably Floris Soop, 1604–1657)
Rembrandt (Rembrandt van Rijn) · 1654
Transatlantic cover to Madrid, Spain
Artist not stated in the record · December 18, 1876
Henry Frederick (1594–1612), Prince of Wales, with Sir John Harington (1592–1614), in the Hunting Field
Robert Peake the Elder · 1603
2c Andrew Jackson pair on transatlantic cover
Artist not stated in the record · June 18, 1875
Transatlantic Cover to Nagasaki, Japan
Artist not stated in the record · 1867
Transatlantic Cover to New York
Artist not stated in the record · 1847
Cover carried aboard Lindbergh's transatlantic flight
Artist not stated in the record · May 20, 1927
Transatlantic cover to Florence, Italy
Artist not stated in the record · December 17, 1863
Transatlantic cover to Haarlem, Netherlands
Artist not stated in the record · November 30, 1845
Transatlantic Cover
Artist not stated in the record · 1871
Transatlantic cover to London
Artist not stated in the record · May 19, 1860
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. 942706 matched · 40 examined · 13 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 00:54 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.