Hamilton Watch Co.,
No. 642529, Official RR Standard
19-jewel Grade 999 18-size, concentric damascened full plate movement adjusted to 5 Positions, signed "Ball Watch Co., Cleveland O.", jewels in settings, double roller escapement, bimetallic balance, overcoiled spring, regulator with index on balance cock (micrometer adjustment lacking), stem wound, lever set, white enamel dial signed "Official RR Standard, Ball Watch Co. Cleveland, O." with black arabic numerals, subsidiary seconds, blued hands, plain Keystone Silveroid Ball Model open face case
54mm