Observatory Split Seconds Chronograph A large, heavy and as new chronometer for sports time-keeping...

Gehäuse
Sterling silver, glazed push back.|Very good.

Zifferblatt
Silvered, blued steel hands|Very good.

Werk
2/3 plate movement, lever escapement, Guillaume screw compensation balance.|Very good, capable of running, cleaning recommended.

WERKNR:127825

dimension:65 mm

circa:1950

weight:235

country:Switzerland

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A split-seconds chronograph (also called a rattrapante chronograph or double chronograph) is a stopwatch with an additional, second 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 in 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.