Cool photo! I have never heard of that coachbuilder. Doing a newspaper search all I find is advertisements looking for machine operators. Basically between 1910 and 1925. This is the only reference to auto body building I could find from July 1916 in the New York Herald.
DEMAND FOR BIG FACTORIES.Massachusetts Plant Bought by Auto Body Makers.Joseph P. Day has sold for the Standard Woven Fabric Company at Walpole, Mass., its factory property at Framingham, Mass., to the Pettingell Machine Company.The plant is twenty-one miles from Boston and twenty-three miles from Worcester. The buildings were completed in August, 1913, and were vacated by the Standard Woven Fabric Company when they acquired the large plant of the Walpole Rubber Company, which they are now operating.The Pettingell Machine Company will use the property for the manufacture of automobile bodies. The Pettingell Machine Company operates a plant at Amesbury, Mass.