From the late 1960s through the 1970s, activist and filmmaker Pat Rocco produced both gay erotic films and documentaries with extensive footage of demonstrations, parades, marches and festivals.
This photo is described on the verso "Quartette #734" by Pat Rocco 4/6. Of course it does not depict men in swimsuits but they wear matching stripe-arm shirts, open and tied at the waist. Each model wears a different hat.
7" x 5" satin finish, heavyweight paper, c. 1970.