White Cedar,
Chum was 15 ft. with 33 inch beam and 12 inch depth (1957 specs); great diagram of in Roger MacGregor's When The Chestnut Was In Flower. Interesting the Peterborough Minetta was produced from 1954 to 1961. It was also 33" wide and 12" deep amidships. Like Chum, it weighed 65 pounds. (As I understand, very likely made by Chestnut for Peterborough under Canadian Watercraft Ltd. auspices, and probably from Chum form.) With its narrow beam and fine entry lines, it is a dream to paddle solo, especially for Canadian Style Paddling or Omering (and that's why I own one).