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. 23 shown for “Armor of Mail and Plate” — 64 records examined, 28 dropped by the rights gate.
Archives queried 2026-08-27 03:07 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Commode à vantaux
David Roentgen · ca. 1775–79 with later alterations
Armor making and polishing
Jan van der Straet, called Stradanus, Flemish, 1523–1605 · About 1580
Armor of Mail and Plate
Artist not stated in the record · late 18th–first half of the 19th century
Watch, chain, and key
Artist not stated in the record · 1875–99
Shirt of Mail and Plate
Artist not stated in the record · 15th–16th century
15c Map of United States and Two Mail Planes, Air Mail plate proof
Bureau of Engraving and Printing · September 14, 1926
Armor
Artist not stated in the record · ca. 1400–1450 and later
10c Map of United States and Two Mail Planes plate proof
Bureau of Engraving and Printing
Armored Cavalryman
Artist not stated in the record · 18th–19th century
4c Overland Mail plate proof
Bureau of Engraving and Printing · September 10, 1958
5c Mail Train plate proof
Bureau of Engraving and Printing
Armor
Artist not stated in the record · ca. 1535
Design for a Carriage Body
Louis Van Nerven, Dutch, active ca. 1750 · 1755–69
Armor (Gusoku)
Bamen Tomotsugu · 18th century
10c Official Mail plate proof
Bureau of Engraving and Printing
Shirt of Mail and Plate
Artist not stated in the record · late 15th–16th century
$1 Official Mail plate proof
Bureau of Engraving and Printing
Shield (Dhàl)
Artist not stated in the record · early 19th century
1c Official Mail plate proof
Bureau of Engraving and Printing · Februray 27, 1911
Harquebusier's Armor of Pedro II, King of Portugal (reigned 1683–1706) with Buff Coat
Richard Holden · ca. 1683 and later; buff coat, 17th–18th century
2c Official Mail plate proof
Bureau of Engraving and Printing
Shirt of Mail and Plate of Al-Ashraf Sayf ad-Din Qaitbay (ca. 1416/18–1496), 18th Burji Mamluk Sultan of Egypt
Artist not stated in the record · ca. 1468–96
2c Official Mail plate proof
Bureau of Engraving and Printing
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. 785 matched · 24 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 3112250 matched · 40 examined · 28 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 2026-08-27 03:07 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.