A film of the 1976 Half Ton Cup has been recently found. This regatta was held in Trieste, Italy, and attracted some 70 yachts. It was a light air series, so the sailing footage is not very dramatic, although the musical score tries hard to give it a lift, but it is interesting to see the wide range (and shape) of yachts competing, and at times the close proximity of the spectator fleet. The footage appears to cover the first two Olympic races, and part of one of the offshore events.
The 1976 Half Ton Cup was won by the Ron Holland-designed yacht Silver Shamrock, which can be seen leading the fleet at the first weather mark. New Zealand was represented by Ian Gibbs' Paul Whiting design Candu II, which was not at her best in the prevailing light winds, and finished sixth overall. Details of Candu II and other photos from the 1976 Cup can be seen here.