It would seem that Martin is playing double sax at various points. See Nick's post 2/5/74: Martin and Martin? for discussion.
listings: Hayward Daily Review, February 1, 1974, p. 43 |San Francisco Sunday Examiner and Chronicle Datebook, February 3, 1974, p. 4 |San Francisco Examiner, February 5, 1974, p. 21
mention: San Francisco Examiner, February 1, 1974, p. 32
ad: San Francisco Examiner, February 5, 1974, p. 20