1971
Drypoint and aquatint in blue
389 × 358 mm, margins 656 × 500 mm
Fine impression on Arches wove paper, signed and numbered 3/12 from an edition of 18 proofs; on the reverse signed, titled, dated and annotated Asse // Ouverture bleue I // 1971 // Pointe sèche
Reference : Masson 163