I went through all of the Aqualung catalogs from 1953 to 1975, and this is what is featured in each year of the catalog as far as hose clamps:
1953-1959: The tinnerman clamp.
1960-1966: "Old style" nylon clamp, with screw only.
1967-1974: "New style" nylon clamp, with screw and nut.