Looking at the broacher of my Swin Ranger Ketch the sail size is described as a number followed by a Delta or PHI symbol (a square with sigma passing through)
Jib 68 Main 110 Mizzen 60
The mast is 23ft Boom 10ft 9ins Mizzen 15ft and mizzen boom 4ft 9ins, try as I may I can not make sense of these numbers.