American Musical Dep't M.B. American musical depot-Main Building 1 stereograph; 11 x 18 cm. Mounted on backing board. Title on label: American musical dep't M.B. Exhibit titles: Mason & Hamlin Organ Co., Boston, Mass., Exhibit #214; Rogers Upright Piano Co., Boston, Mass., Exhibit #275, Main Exhibition Building, Bldg. #1. Several upright pianos and organs.