Chelsea Clock Co., Boston, Mass., for American Steam Gauge & Valve Mfg. Co., Boston, engine room timepiece, 8 day, time only, spring-driven jeweled balance wheel movement in a brass case with screw-on bezel, 6 inch silvered dial inscribed with "American S

Chelsea Clock Co., Boston, Mass., for American Steam Gauge & Valve Mfg. Co., Boston, engine room timepiece, 8 day, time only, spring-driven jeweled balance wheel movement in a brass case with screw-on bezel, 6 inch silvered dial inscribed with "American S.G. & V. MFG. CO. / BOSTON U.S.A.", large subsidiary seconds below the center arbor, and blued steel hands. brass case has an old finish with lacquer that is starting to turn to fine brown spots. Silvered dial is very good with just the slightest yellowing of the protective lacquer. Hands are original Rectangular Chelsea movement ticks. Movement serial number 115363.