Michael Stack (American, b. 1947). Oil on canvas titled “Sonoita Windmill,” depicting a windmill standing above a plain. Signed and dated 1978 along the lower right. Titled along the brass nameplate on the frame. Sight; height: 7 5/8 in x width: 9 5/8 in. Framed; height: 15 1/4 in x 17 1/4 in.