(1) As Sumowski (op.cit.) points out this may be compared to portraits of the Van Ruyt couple in the collection of the Koninklijk Oudheidkundig Genootschap, Amsterdam, dated 1670 (op.cit., nos. 1553-4), the signatures of which likewise indicate the artist's profession. The present lot would seem to be related to the portrait of a woman dated 1670 of comparable size and technique with the same background in reverse (Sumowski, op.cit., no. 1552), thus possibly forming a pair with the present lot.