Grade 261

7 jewels. Olive hole balance jewels. Plates – nickel. Nicely damaskeened. Ray visible winding wheels. Recoiling click. Dust band. Balance – cut expansion balance. Meantime screws. Breguet hair spring. Tested on half time without hair spring. Closely timed. Hunting. Total production 20100. First run – 1905, last run – 1909.