Masé was born in Trieste. While still a teenager, he joined the laboratory for young actors of the production company Vides by Franco Cristaldi and studied acting under Alessandro Fersen. He made his stage debut in 1960 in L'arialda, directed by Luchino Visconti, and his film debut in the 1961 adventure Romulus and the Sabines by Richard Pottier. He had several leading roles in the first half of the 1960s, including Marco Bellocchio's Fists in the Pocket and Jean-Luc Godard's Les Carabiniers, then he was mainly cast in supporting roles. Masé is also active in the adaptation of the dialogues for dubbing.

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