Seconds, Seconds, Seconds, Seconds

A fascinating complication that only a few watches have-press the additional button, the chase second hand that originally moved with the chronograph second hand will stop turning; press it again, the chase second hand It will immediately follow the chronograph second hand. This is the two-second chronograph.

The two-second chronograph has complex timing functions
As a complex chronograph function, the manufacture of the two-second chase hands began in the pocket watch era around 1883. In 1921, Ralco pioneered the introduction of chronograph watches with two-second chase hands. Valley watchmaker Victorin Piguet has launched a similar product.
The so-called double-second tracking hand (Rattrapante) refers to the addition of a second chronograph hand on the basis of ordinary chronographs. When the double-tracking button (usually located near the 10 o’clock) is pressed, the second chronograph hand The chronograph hands are separated, and two sets of time numbers are recorded at the same time.
Compared with ordinary chronograph watches, the two-second chronograph chronograph is not only more difficult to manufacture, but also more expensive, but the thickness of the entire watch will be 50% more than that of an ordinary chronograph movement with a similar structure. The number of watches produced is very small, and almost no one made these watches after the 1960s.
After the 1980s, with the introduction of Blancpain 1186 movement, a series of new products began to compete in this market, especially the two-second chronograph watch introduced after the transformation of the 7750, which greatly reduced this complex technology Entry threshold. However, different manufacturers often use different methods to modify the dual-second tracking function. IWC installed the dual-chasing module developed by itself on the back of the 7750 as the basic movement, while Chronoswiss and earlier Athens (Ulysee Nardin) puts the dual-tracking component under the dial to form a unique pattern that shifts the hour and minute display to the eccentric place at 3 o’clock.
In addition, Zenith has also developed a large calendar two-seconds chronograph on the basis of its famous El Primero movement, and Omega has developed its own coaxial escapement chronograph also developed a two-seconds chronograph The function and the strong self-style design attract the watch fans (commonly known as panda eyes).

The difficulty is how to precisely stop the two seconds hand
Break through technical difficulties
技术 A technically difficult point for these watches is how to precisely stop the two chronograph hands of the two-second follow-up hand. It is usually controlled by a two-arm chasing second-hand clamp. The arms must be closed and closed at the same time. The cylindrical gear transmits instructions to the two-arm second-hand clamp. Chasing seconds hand gear. The two-second chase hand is stopped by the button, and it can return to the lower part of the ordinary chronograph second hand and continue to jump together.
In today’s increasing number of two-second chronographs, Patek Philippe 5959 is not only considered to be full of classic taste, but also the thinnest and most complex two-second chronograph. The watch is actually with the help of an electronic computer to reduce the gap between various parts to a minimum, and uses CNC numerical control machine tools to process important parts. Of course, with the support of high technology and fine manual polishing, it can make it perfect. In addition, the structure of the form button and bracelet, the beautiful column wheel, the swing frequency of 21,600 times / hour, and even the diameter of 33.2 mm are all very classic.
Relatively speaking, although the Double Split developed by Lange Datograph is also classic in design and is also a bracelet version, it is more modern in function-except for the luminous hands, the watch There is also a very practical power reserve display and flyback function. The latter setting requires the power of two chronograph hands to be disconnected at the same time, so the difficulty is greatly increased. Technology fans are also impressed by the double-second tracking time, which can record up to 30 minutes, unlike other double-tracking, which can only record time differences within 60 seconds. The new structure developed for this The table appears extremely complicated. However, such spareless innovation is mainly focused on practicality.