Crosby Steam Valve & Gage Co Tri note locomotive whistle. Stamped in the bottom Crosby Steam Gage & Valve Co. Boston U.S. Pat Jan 30 1877 and measures 14.5in long x 4in diameter. Complete with valve, in lightly cleaned condition. It is believed that it was last used at the Flowers Brewery in Stratford Upon Avon as a workers time signal.