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The number on the sail represents the number that exsisted when that boat was produced. The problem is that people buy second hand sails and put them on newer boats, or they buy new sails and put them on old boats. But the number only really matters when you race not the colors. Plus you can order old colors if you want. It just costs more. Every year they offer standard colors for that year in various combinations, or you can just get white. Here is a link to the Hobie website. They have lots of cool things but to see the catamarans you need to click on the sailing tab.
HOBIE CAT