Hindman's Spring Fine Art sales to feature important works by Andy Warhol, Cy Twombly, and others Joan Mitchell (American, 1925-1992), Untitled, 1989. Estimate: $500,000-700,000. CHICAGO, IL .- This May, Hindman will present three days of fine art sales featuring nearly 500 works of art. The auctions will kick-off with American and European Art on May 3, followed by Post War and Contemporary Art on May 4, and conclude with Prints and Multiples on May 5. Outstanding collections and artworks will be featured including important works by Joan Mitchell, Andy Warhol, Cy Twombly, Alexander Calder, and others. Mitchells extraordinary Untitled, 1989 (lot 32) will headline the three sales and will be offered at $500,000-700,000. Untitled, 1989 is from a Private Collection (Atlanta, Georgia) and was purchased from Cheim & Read in New York in 2012.