From Phillips.com:
Lithograph in colors, on Arches paper, with full margins,
I. 30 1/2 x 22 1/2 in (77.5 x 57.2 cm); S. 36 7/8 x 25 7/8 in (93.7 x 65.7 cm) signed and numbered -/50 in pencil (there were also 25 artist’s proofs in Roman numerals).
Appraised by: fineartsappraisalservice.com