Geometrical Abstraction - Op Art Almir da Silva Mavignier B-6. 1973. Colour silkscreen on smooth PVC film. 84 x 84 cm (89 x 89 cm). Signed, dated, inscribed "B-4" and with handwritten dedication by the artist. - Few and inconspicuous creases in sheet margins, occasional barely noticeable surface rubbing, PVC film slightly rolled due to storage. Very good overall. Splendid and velvety impression of the large-format image with margin. With dedication by the artist to the Brazilian diplomat Mário Calábria: "Para Mário Calábria... dela anniversario 50..." - Calábria was ambassador to the German Democratic Republic in Berlin from 1978. After his retirement, he lived in West Berlin. Colour serigraph on vinyl foil. Signed, dated, inscribed "B-4" and with handwritten dedication by the artist. - Few and inconspicuous creases in the margins, occasional barely noticeable surface rubbing, vinyl foil slightly rolled due to storage. Overall very good. Splendid and velvety impression of the large-format depiction with margins. - With dedication by the artist to the Brazilian diplomat Mário Calábria: 'Para Mário Calábria... dela anniversario 50...' - Calábria was ambassador to the German Democratic Republic in Berlin from 1978. 500