monogrammé et daté 'A58' (en bas à droite); signé, daté et inscrit '"Study to Homage to the Square: Receptive" Albers 1958' (au revers). with the monogram and dated 'A58' (lower right); signed, dated and inscribed '"Study to Homage to the Square: Receptive" Albers 1958' (on the reverse)