120 - Ulysse Nardin Le Locle - Observatory Split Seconds Chronograph

Ulysse Nardin Le Locle - Observatory Split Seconds Chronograph (*) A large, heavy, and like-new chronometer designed for sports timing, featuring a split-seconds chronograph and a 30-minute counter. Includes the Ulysse Nardin "Bulletin de Marche du chronometre de chronographe" Movm. No. 127825, Dimensions 65 mm, circa 1950, Weight 235 g, Origin: Switzerland Case: Sterling silver, glazed push-back. Dial: Silvered, blued steel hands Movement: 2/3-plate movement, lever escapement, Guillaume screw-compensated balance. A split-seconds chronograph (also called a rattrapante chronograph or double chronograph) is a stopwatch with an additional chronograph seconds hand that allows for the measurement of intermediate times without stopping the main timing mechanism. Normally, the split-seconds hand aligns perfectly with the regular chronograph seconds hand and runs invisibly alongside it. An additional pusher (usually at the 10 o’clock position) stops the split-seconds hand while the main hand continues to run. The intermediate time can then be read. Pressing the rattrapante pusher again instantly sets the split-seconds hand to the same position as the main hand, and it resumes running. Due to its intricate mechanical heart-shaped clamp mechanism, this complication is considered the pinnacle of watchmaking. Case: very good. Dial: very good. Movement: very good, in working order, cleaning recommended.