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Pieter Adraensz. van der Werff by Jan de Bisschop. en Bust of Pieter Adraensz van der Werff after Hendrick de Keyser Pen and brown ink and wash over black chalk cm inscribed verso Burgermeester Vander Werff van Leyden inscribed verso de Bisschop hoog br century sothebys html Sotheby's Creator Jan de Bisschop PDold