Rarity classifications

Unique
This artwork is one of a kind.

Limited edition
The edition run has ended; the number of works produced is known and included in the listing.

Open edition
The edition run is ongoing. New works are still being produced, which may be numbered. This includes made-to-order works.

Unknown edition
The edition run has ended; it is unclear how many works were produced.

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Certificate of Authenticity

A certificate of authenticity (COA) is a document from an authoritative source that verifies the artwork’s authenticity. While many COAs are signed by the artist, others will be signed by the representing gallery or the printmaker who collaborated with the artist on the work. For secondary market works, authorized estates or foundations are often the issuing party.

COAs typically include the name of the artist, the details (title, date, medium, dimensions) of the work in question, and whenever possible an image of the work.