No. 208046, Brotherhood of Railroad Trainmen Official Standard, in BRT monogrammed case
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 Watch Co., Cleveland, O." with black arabic numerals, subsidiary seconds, blued hands, Keystone 20-year open face case engraved with BRT monogram
55mm