Grade 504, 17 ruby and sapphire jewels unadjusted, manufactured from 1914 to 1920 a total of 6,510 movements in 17 runs make up this grade. Model 4 size 12/14 open faced; bridge movements of medium quality, double roller and patent micrometric regulator.
Observations, The majority of movements have broad striped pattern demaskeening named Hallmark. The remainder are bright striped pattern and named Illinois. The size 12/14 movements have a size 12 bridges and size 14 pillar plate and have a stretched enamel dials that are not recessed into the pillar plate, they require special cases.
Description, 17 ruby and sapphire jewels; oreide settings; spring tempered compensating balance with timing screws; hardened and polished steel escape wheel; sapphire pallets and jewel pin; polished gold center wheel; patent Breguet hairspring; micrometric screw regulator; safety screw center pinion; concave and polished winding wheels; safety recoil click; demaskeened broad striped pattern; gold inlay engraving; unusually large dial is a special feature of the watch.