Discussed in these Forum posts:

how to tell how old a sail design is?
Is it possible just by looking at a sail whether it is the twisting leech design or not? ie a "new' style sail that suits "modern" boards with the mast track back compared to the old ones.
View topic

More like this

Return To Classic site 😭
Or... let us know if a problem, so we can tweak! 😅