Lot 72
RECTA, STAINLESS STEEL MONO-RATTRAPANTE CHRONOGRAPH POCKET WATCH
CASE NO. 38’298
Fermé21 July 2020
Estimation
CHF 2,000–4,000
Plus d'informations
Note du spécialiste
Preserved in excellent and original overall condition, the present openface keyless lever chronograph is fitted with the caliber Valjoux 84 movement with a mono-rattprante or semi-split chronograph mechanism. It furthermore stands out by the very attractive two-tone silvered dial with blue timing scales.
Invented and patented by Charles Jeanrenaud-Bovet in 1936, this chronograph system features similar functionality to the traditional split mechanism while being equipped with only one chronograph single sweep seconds hand.
An additional hairspring enables the chronograph movement to accommodate a kind of "catch-up mechanism" on the chronograph sweep seconds hand without influence to the delicate roller and heart system.
When the chronograph mechanism is started with the pusher at 2 o'clock, the sweep second hand can be temporarily stopped by holding the pusher at 4 o’clock while the chronograph movement continues to run. By releasing the pusher at 4 o’clock the sweep second hand will catch up the actual time elapsed by the number of seconds the wheel has been stopped, recording the total time elapsed since the chronograph has been started.
This rare timepiece combines an unusual mechanism with a very well preserved two-tone dial and a crisp stainless steel case, making it a superb example for the demanding collector.
Invented and patented by Charles Jeanrenaud-Bovet in 1936, this chronograph system features similar functionality to the traditional split mechanism while being equipped with only one chronograph single sweep seconds hand.
An additional hairspring enables the chronograph movement to accommodate a kind of "catch-up mechanism" on the chronograph sweep seconds hand without influence to the delicate roller and heart system.
When the chronograph mechanism is started with the pusher at 2 o'clock, the sweep second hand can be temporarily stopped by holding the pusher at 4 o’clock while the chronograph movement continues to run. By releasing the pusher at 4 o’clock the sweep second hand will catch up the actual time elapsed by the number of seconds the wheel has been stopped, recording the total time elapsed since the chronograph has been started.
This rare timepiece combines an unusual mechanism with a very well preserved two-tone dial and a crisp stainless steel case, making it a superb example for the demanding collector.