Inscription
in image, at bottom right, in red ink: Hayter; in image, at bottom right, in graphite: 9 10.4.79; on verso, in graphite, by later hand: CONSTRUCTION IV / ACRYLIC - WATERCOLOUR
in image, at bottom right, in red ink: Hayter; in image, at bottom right, in graphite: 9 10.4.79; on verso, in graphite, by later hand: CONSTRUCTION IV / ACRYLIC - WATERCOLOUR