We are grateful to Dr. Rudi Ekkart of the R.K.D. for identifying the present sitter as Maria Crap (died 1727) from Enkhuizen. He points out that the picture has a pendant in the Portrait of Pieter Uyl in a Landscape, also signed, sold at Christie's, London, 16 December 1988, lot 93. Both pictures were presumably commissioned to celebrate their marriage in 1674. The artist is as yet unidentified.