The Collection of heirs of Franz Koenigs (1881-1941), sold with the advice of Art Consult at auction at Sotheby’s in New York and London for a total of more than € 6 million. Illustration: Hans Bol (1534-1593), the month of May, from a series of 12 months, pen and brown ink, roundels, sold for $ 1,765,750 (now in Museum Boymans van Beuningen, Rotterdam).