Conn 6M Artist Alto
Date: 1966. Owner unknown
Models after 1948 didn't have rolled tone holes. Models after 1954 didn't have a microtuner neck. The name "Naked Lady" was dropped in 1959 in favor of the "Artist" designation. In 1963 Conn introduced sheet-metal keyguards and a different bell-to-body brace, although the original style was still available until 1969 (source: Saxpics)
What Conn said in 1966:
An outstanding instrument for professionals and advanced students. Extremely popular with lead alto saxophonists because of its clarity of tone and great carrying power. Special design "underslung" octave key. Nickel plated keys.