'About 1888 he changed the name to the Philadelphia Watch Case Co. THEOPHILUS ZURBRUGG bought out the watch case company of Leichty & Le Bouba in 1884, in Philadelphia, Pa. Silverode was a logo of the Philadelphia watch case Company indicating that the metal alloy had several different white metals in the composition, all EXCEPT silver. White enameled dial with Roman hour chapter ring, sunken subsidiary seconds at 6, closed minute ring to the outside, steel Breguet hands and the dial marked for E. There is a compressed fluted ball pendant and bow for winding and setting, at the three position.

Size 'N' or 18S open face case made of Silverode white metal (notes) with the engraved imprint of a locomotive on the outer cover, while inside the cover the casemaker mark of the Philadelphia Watch Case company (notes) is noted with case number 903071. Jewels, some in gold settings, adjusted to heat and cold (marked on theīridge), Ball/Howard type regulator with bi-metallic balance wheel, serial number 202906 and marked for the E. Stem wound and stem set, three quarter gilt brass plate with 15 See our Keystone-Standard History page for information on your Keystone-Standard watch.Gent's 18S (N size), stem wound and stem set, silverode (notes), open face pocket watch, Series VII, S/N 202906, made by the E.Howard Watch Co, Boston, circa 1883-1885. Keystone-Howard watches should not be confused with watches from the Keystone Standard Watch Company which operated in Lancaster, Pennsylvania from 1886 to 1891 when it was sold to the Hamilton Watch Company. For information on original 'pre-Keystone' Howard watches, please see our Howard Company History page.

Howard watches, though many were fine watches in their own right. These watches, dubbed 'Keystone-Howards' by collectors, are not as highly prized by collectors as original E. they were cased and timed at the factory. Boston U.S.A.' and were sold as complete watches only i.e. The watches of the Keystone era are typically marked 'E. There were no patent rights transferred, just the use of the 'E. Howard' name, at the time one of the most highly-regarded American watch brands, were purchased by the Keystone Watch Case Company in 1902. Howard Watch Company (Keystone) Including Serial Numbers and Production Dates Waltham, Massachusetts 1902 - 1930

Keystone watch case serial numbers