Art with questionable authorship is not chosen for SavvyCollector . I offer full disclosure. You are never made to guess about this important aspect. Art is inspected before it is considered for sale. Art works are photographed and a condition report is issued before art is shipped.
Estates are the main source.
Individuals are inheriting art that is wonderful, but that does not personally agree with them. Aunt Matilda may have had an excellent taste in art, but if it is different from yours, you may prefer to sell it. My 25 years of experience as a Personal Property Appraiser guides me in carrying out current research. I review primary transactions which means contacting galleries, artist's agents or in some cases the artists when they are the sole purveyor. I frequently double box items.