Included as a bonus when Rhino Records released Lenny Bruce in 'Lenny Bruce' (1967) on VHS under the title "The Lenny Bruce Performance Film" with a soundtrack CD as a box set in 1992.
Lenny Bruce died in 1966, so obviously his voice work for this film was done in 1966 or before 1966.
The film was completed and copyrighted in 1968.