Bridget Riley Untitled (Nineteen Greys) The complete set of four screenprints in colour, plus the additional fifth screenprint on mylar, 1968. Each signed in pencil and numbered 10 from the edition of 75. In the original grey board portfolio with title, colophon, text and justification pages. Printed on card by Kelpra Studio, London. Publisher unknown. (Schubert 8a-d) Each 75 Ă— 75 cm
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