Getting a Sail Number
Note: the following does not apply to the U.S.A.
When you get your new sail it probably will not have the necessary sail numbers on it. These are issued by the national sailing association or, in some cases, by the National Optimist Association.
Find out from your national Optimist Association and send whoever issues them the Registration Book you will have received with the new boat and the appropriate fee.
There are new rules on the type of Letters and Numbers that can be applied to an Optimist Sail. Check out the Racing Rules of Sailing Appendix G located here before you apply any numbers to your sail.
For details of where to put the numbers see the document below Get your Sail Numbers right!