No.B0056648, Brotherhood of Railroad Trainmen Official Standard
17-jewel 16-size concentric damascened divided ¾ plate adjusted movement, signed "Ball & Co., Cleveland, O.", gilt BRT medallion, gold center wheel, jewels in gold settings, bimetallic balance, overcoiled spring, micrometer regulator, lever set, white enamel dial signed "BRT Standard, Ball & Co., Cleveland", arabic chapters, subsidiary seconds, blued hands, plain screw back Ball Model Keystone Silveroid open face case
50mm