Anyone have an educated guess as to the value of a 30 year old never flown mainsail? Sail is full batten (4), one reef, luff 32.25, foot 11.50. Dacron, guessing 7 oz. fabric. Maker unknown. Assuming that the sail is not dry rotted and in usable condition, what's it worth? I'm considering purchasing and will be able to refuse if it's not serviceable, but I need to make an offer.