|C&C didn't do "factory" the way companies now do (container-loads of sails from the Orient). Instead, they had deals with the major lofts for a suit of sails at different performance levels. You chose your loft and you got a slightly discounted suit of sails - which, remember, were locally made, with variations to suit the prejudices of the local sailmaker. What one customer got in Toronto would probably be quite different from what someone got in Rochester (different loft, different sail with - probably - different batten pockets). You're going to have to measure.
C&C 27 Mk IV