The 1979 World Champ, John Gallagher, sends along these photos, taken by Peter Gale, of that championship.
John Gallagher, with his brother Dave, in US 906
The double wire, much lighter, Aussie 14-footers were invited as an "open class". The International 14's were able to stay with, and even win, against them in the light air races but once the Aussie 14-footers were able to use both wires, they were away.
This appearance by the Australians at the 1979 Worlds was the beginning of the International 14 class moving towards an Aussie 14. Today the modern International 14 is considered an Aussie skiff without reservation.