White Line Square V from "White Line Squares Series I". 1966. lithograph on Arches wove paper (with watermark). 40 x 40 cm (53 x 53 cm). Monogrammed "A", dated and inscribed "Artist's proof XII" and "WLS - V". With the publisher's dry stamp lower right. - Evenly browned in the former mat opening. Light surface soiling in places. Good overall. Excellent and colourful impression of the image with margin.