FRANK STELLA, PROTRACTOR VARIATION IV, 1968
signed, titled and dated 1969 on the stretcher
acrylic and graphite on shaped canvas, in artist's frame
2 1/8 by 4 1/8 in. 5.4 by 10.5 cm.
OK Harris Works of Art, New York
Private Collection, New York (acquired from the above circa 1969)
Sotheby's, New York, 25 September 2013, Lot 324
Acquired from the above sale by the present owner