18 size grade 313

Grade 313

Jewels – 17 ruby and sapphire jewels. Composition settings. Olive hole balance jewels. Plates – nickel. A most attractive pattern of damaskeening. Recoiling click. Dust band. Setting – lever. Self-locking setting device. Balance – chamfered and polished compensating balance. Meantime screws. Breguet hair spring. New stationary hair spring stud. “Precision” nut and screw regulator. Escapement – double roller escapement. Steel escape wheel. Tested on half time without hair spring. Adjustments – adjusted to temperature. Very closely timed.  Dial – single sunk, glass enamel, ground edge dial. Finish – bevel head plate and jewels screws. All visible steel work polished.

Open Face. Lever set. First run – 1908, last run – 1912. Total production 8000.