There's a suit of sails for sale on ebay at the moment - they look like they may be Alverbanks and the seller reports that:
The sails are off a 1971 China doll with a needlespar mast. They were measured in 1977, the measurements are:
3/4 1065,
1/2 1640
1/4 2065
The item description is #7232071125 - National 12 sailing dinghy sails. From the pics they don't look in bad condition and might just be of use to someone in the class. Happy bidding,
Bernard
N3447