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. 24 shown for “Envelopes to be printed in memo” — 64 records examined, 10 dropped by the rights gate.
Archives queried 2026-08-31 23:16 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Valentine
Anonymous · 1850–79
Envelopes to be printed in memo
Artist not stated in the record · September 6, 1883
Valentine - Mechanical, flowers with hidden messages, sachet
Anonymous, British, 19th century · ca. 1875
6-cent, Air Post Envelope Working Die
Bureau of Engraving and Printing · c. 1948
Pair of candlesticks
Jacques Demé · 1690–91
Printing instructions for envelopes in letter
Artist not stated in the record · December 15, 1883
Armor Garniture, Probably of King Henry VIII of England (reigned 1509–47)
Royal Workshops at Greenwich · dated 1527
Absentee ballot interior return envelope
Artist not stated in the record · 1944
Clavichord
Christian Kintzing · 1763
1874 Newspaper and Periodical card plate proof envelope
Artist not stated in the record · 1893
Virgil's Tomb by Moonlight, with Silius Italicus Declaiming
Joseph Wright (Wright of Derby) · 1779
1865 Newspaper and Periodical card plate proof envelope
Artist not stated in the record · 1893
Antoine Laurent Lavoisier (1743–1794) and Marie Anne Lavoisier (Marie Anne Pierrette Paulze, 1758–1836)
Jacques Louis David · 1788
1873 Treasury Department card plate proof envelope
Artist not stated in the record · 1893
Wolf and Fox Hunt
Peter Paul Rubens · ca. 1616
1873 War Department card plate proof envelope
Artist not stated in the record · 1893
The Boston Massacre, or, The Bloody Massacre perpetrated in King Street, Boston on March 5, 1770 by a party of the 29th Regiment
Paul Revere Jr. · 1770
1873 Department of State card plate proof envelope
Artist not stated in the record · 1893
A Dance in the Country
Giovanni Domenico Tiepolo · ca. 1755
1893 Columbian card plate proof envelope
Artist not stated in the record · 1893
A Hunting Scene
Piero di Cosimo (Piero di Lorenzo di Piero d'Antonio) · ca. 1494–1500
1878 Postage Due card plate proof envelope
Artist not stated in the record · 1893
Odalisque in Grisaille
Jean Auguste Dominique Ingres · ca. 1824–34
1870 Issue card plate proof envelope
Artist not stated in the record · 1893
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. 7201 matched · 24 examined · 3 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. 7483552 matched · 40 examined · 7 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 23:16 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.