Provenance:
Horatio Granville Murray Stewart, dates unknown; David M. Koetser Gallery, by 1957; purchased from gallery by Seattle Art Museum, January 4, 1957
In the provenance of an artwork, the name "Koetser" can refer to "Koetser Gallery", "David M Koetser", "Leonard Koetser", "Brian Koetser", "Henri Koetser", "Asscher, Koetser and Welker" and more.
How to distinguish them all?
At the NGA in Washington, for example, a search on Koetser will return three possibilities:
 |
| NGA search choices for Koetser |
Koetser is known to have used several pseudonyms in art dealing transactions. Aliases are said to include: "H. Cevat", "Rocker", "Level" and "Kaye".
Like Speelman, with whom Koetser sometimes does business, Koetser appears in the provenance of numerous paintings at institutions such as the Seattle Art Museum, the National Gallery of Art in Washington DC, The Museum of Fine Arts in Boston, and the Rijksmuseum in the Netherlands.
For a few examples see:
https://www.openartdata.org/2019/03/explorations-in-digital-art-history.html