Old master and British drawings and watercolours : including works from the collection of Jean Bonna : Tuesday 2 July 2019 : properties from: the Blair Charitable Trust, the collection of Jean Bonna, the collection of Walter Brandt, the descendants of Charles Church, a descendant of the Grote Family, the property of the 7th Earl of Harewood's Will Trust sold by order of the trustees, the collection of Drue Heinz, the collection of Albi Rosenthal, the Ross Collection from Knockmore, Enniskerry, Wicklow, the late professor Eric Stanley, the estate of Anthony Wingate - Bonna, Jean (Auction / Christie's, 2019)