No. 13108, Brotherhood of Railroad Trainmen Official Standard
17-jewel Grade 999 18-size, concentric damascened full plate adjusted movement signed "Official BRT Standard, The Ball Watch Co., Cleveland O.", jewels in settings, double roller escapement, bimetallic balance, overcoiled spring, swan's neck regulator with index on balance cock, stem wound, lever set, white enamel dial signed "Official RR Standard, Ball & Co. Cleveland, O." with black arabic numerals, subsidiary seconds, blued pierced Ball patent hands, doubly glazed Hamilton metal display case
52mm