Movement based on the Swiss invention patent No. 185 465, delivered on July 31, 1936 (application filed on July 30, 1935), to Charles Jeanneret-Bovet, Fleurier (Val-de-Travers), for a “Chronographe”.
Bovet, “Mono-Rattrapante”, patented “single” split-seconds with one hand
It was in 1935 that Bovet Frères & Co. created and patented a “mono-rattrapante” chronograph system that acted similarly to a split-seconds mechanism. This chronograph movement with a single hand is elaborated by Bovet on the Valjoux 14’’’ calibre 84.
This particular wristwatch features the three normal functions of any single-button chronograph, activated through the push-piece at 2, enabling the chronograph hand to: “start” / “stop” / “return to zero”.
In addition, there are two further functions activated through the push-piece at 4:
1) By depressing the push-piece, the single chronograph hand stops.
2) By releasing the push-piece, within a maximum time of 60 seconds, the hand jumps forward, catching-up the seconds elapsed in the meantime.
Two versions of this wristwatch exist:
• The first, features a round, flat push-piece at 2 and an olive-shaped push-piece at 4.
• The second version has either a square or a round waterproof push-piece at 2 and at 4.
• Lang, Gerd-R., & Meis, Reinhard, Chronograph Wristwatches, To Stop time, Atglen, PA, 1993, Editions Schiffer Publishing Ltd., pp. 21, 50-51, 180-181 (ill. 337-338) and 238.