Irregular Forms (Flat and Glossy Colors) with Black Border 1-4

SOL LEWITT (1928-2007) Irregular Forms (Flat and Glossy Colors) with Black Border 1-4 the complete set of four etchings with aquatint and screenprint in colours, 1998, on Somerset wove paper, each signed in pencil, numbered 12/20 (there were also six artist's proofs), published by Edicions T, Barcelona Plate 584 x 787 mm. (each) Sheet 698 x 888 mm. (each) (4)