The One Ton Cup was founded in 1899 by the Cercle de la Voile de Paris and is therefore the oldest French trophy in yachting.
From 1907 to 1955 the cup was the object of a major competition for 20-foot (6-metre) yachts, but with the decline of that class the cup was put up for challenge in 1965 by the Cercle de la Voile de Paris for boats rated up to 22 feet (7 m).
The size of the boat is set by the measurement formula of the Royal Ocean Racing Club of Great Britain.
As an international event, the One Ton Cup is run under ISAF (International Sailing Federation) rules.
Competing nations could enter up to three yachts each, with the winning yacht determined by performance in a series of races.
Since 1999 the Cup is given to the Corel 45 Class World Championship.
The layout is the most technical one, that is a windward-leeward circuit between two buoys.
Two or three legs are run every day, points being given according to the finishing order (1 point to the first, 2 points to the second, etc.). The final ranking is set up after the last leg, the winning boat being the one with the lowest score.
Unfortunately, we can’t find an official website.