Getty Provenance Index
Over 2.2 million records from archival inventories, sales catalogs, and dealer stock books in the US and Europe dating from the late sixteenth to the early twentieth century. Search across the whole database at once or choose to search any combination of source materials.
The Getty offers additional provenance databases at this link: https://piprod.getty.edu/starweb/piadd/servlet.starweb?path=piadd/piadd.web