Last year I was trying to figure out the total boats sold (H16's)by sail numbers as this is how they keep track of total number of boats sold. Each Hobie Company gets a set of number each year to put on their sails. Currently there are just about 110,000 H16's sold, so I really think so with that many numbers I really do not think you will not have to worry to much about a duplicating number. I had a new flat top main made and am putting the same number I have on my current stock H16 sail.<br><br>