Barbara van Winkelen Watercolor on Paper “Opaline Blue Vase” Consign Now DeptFine Arts, Nantucket ArtSize10 ½ in. x 7 in. Barbara van Winkelen (American 1919-2010) Watercolor on Paper “Opaline Blue Vase”, signed lower left B. van Winkelen, dated 2000 10 ½ in. x 7 in. Please note that this auction has ended. Click here for an overview of this auction.