I know this is only a question of semantics, but another division might confuse folk. Depending on the numbers racing different PY’s for sails 3400-3700 could be applied within the existing silver division.
What needs to be understood is why the newer boats are faster? If it’s construction with different materials, then the introduction of the new method becomes the cut off point. The hull shape is the same after all.
Bobby’s post needs to be put in perspective as well, most of the classics I sail against wouldn’t have the faintest hope of getting near a 3600 sail number, it is a tribute to Bobby and his CREW together with his superb boat that they even come close!