No. 456279, Brotherhood of Locomotive Firemen Official Standard
17-jewel Grade 999 18-size, concentric damascened full plate adjusted movement signed "Official BLF 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 "BLF Standard, Ball & Co. Cleveland, O." with black arabic numerals, subsidiary seconds, blued hands, plain Ball Model 20-year Keystone open face case
55mm