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From 1729 to 1764, during these thirty-five years, Goldbach and Euler have always kept in touch with each other by correspondence.

On 7 June, 1742, the Prussian mathematician Christian Goldbach wrote a letter to Leohard Euler in which he proposed the following conjecture. He wrote: “My question is this: take a high-end watch, such as the extremely complex IWC watch, how many parts does it have?” Euler wrote back: “I have no way to prove this proposition.” Thus, well-known Goldbach conjecture was born. Of course, this is a joke. However, how many parts are there in a watch in the end?

Here, we will talk about the parts of movement of a complex watch.

Omega Hour Vision
Known: Omega hour vision
Proof: 202 parts
Prove: In order to enhance brand existing patent – Co-Axial escapement technology, Omega took five years to develop the 8500 movement. The co-axial escapement system which wad born in 1999 is studied by the British watch-making masters Dr. George Daniels. This development can reduce friction of escapement system components and energy consumption. With free sprung-balance hairspring, even the movement move for a very long time, it is still accurate and stable. This device makes the watch almost no need to add lube. The new Hour Vision watch is equipped with this movement.

The release of the highly anticipated Omega Hour Vision is a pleasure. The design of Hour Vision Series design is unique and innovative, which are also elegant classic. Its innovative new element – the sapphire glass walled case – can be seen clearly when the watch is held up close to the eye. Apart from this new design detail, the watch is a well made classic three-hand watch. Its open exhibition back shows off a movement that is better finished then the regular lines from Omega. This is evidence that Omega is making a serious effort to break into the higher end of the luxury watch market.

Rotonde De Cartier Chronographe Central
Known: Rotonde de Cartier chronographe central
Proof: 272 parts
Prove: The primary distinguishing feature of this new Rotonde de Cartier 9907 MC calibre watch is the isolated chronograph display in the centre of the dial. This ingenious arrangement offers both exceptional legibility of this traditional complication and a novel way of displaying the time. Timekeeping occurs on two levels: the lower level is devoted to displaying the hours and minutes using blued hands which are invisible save for the tips, while the upper level is dedicated to the chronograph function. In the centre, the slim blued seconds hand begins to move when the corresponding push-piece is pressed, while the large counter in the form of an arc records each of its revolutions up to thirty minutes. Thus, the hands indicating the time never obscure those of the chronograph. The central chronograph counter is held as if weightless above the dial by a sapphire ring, whose discreet presence adds to the complexity of this construction, for which a patent request has been registered.  

Compared to its more conventional equivalent, it thus has three crucial advantages:
• It renders the usual braking and blocking levers, used to keep the various elements of the chronograph display in position after measurement, superfluous.
• It allows the chronograph hand to advance smoothly from the very beginning of time measurement and to move with perfect regularity according to the rhythm dictated by the vibrations of the balance, i.e. in eight little steps per second on the 9907 MC calibre. The precision of the chronometric function is thus improved.
• Activating or deactivating the chronograph only has a very marginal effect on the amplitude of the balance. Such an original function thus enables Cartier to forgo the small seconds. The control is then assured by the chronograph hand, which can remain permanently in motion.

The value of buy a famous watch is its using value. But more important is the collection value. Those people who love watches are all watch collectors. Those antique watches are specially catching their eyes. Maybe you are the person like this. Here, I will introduce you some ways of collecting antique watches.

1. You can collect these from the second-hand market or flea market. Many famous watch collectors are their frequenters. Chen Yun-Yao, a well-known Chinese watch collector, collected a rare Swiss hanging watch, which was found in a junk store.

2. You also can gather them from the time-honored watch store. Zhixiong Wu, Shanghai famous antique watch collector, devotes all his spare time to collecting watch. Sometimes, in order to get a suitable case or a hand, he would go to every parts store of watch in the city. There, he can find what he needs and study skills.

3. Of course, you can buy what you like in the store. The cultural relics stores, junk stores, consignment shops, pawn shops are also good choice.

4. Buy antique watches from your friends. More communication with friends who love watch will give you surprise. Maybe, they have the watch you are looking for.
5. Buy them from antique relic trader. Although these watches may be second-hand or more old, or have a higher price, it is a effective way.

6. Another way is buy antique watch from auction meetings. You can gather the information through TV, advertisement and news. Taking part in auctions often is absolutely a good choice.

When a man falls in love with racing car, it is a common phenomenon that he also shows interest in wrist watch. There is something in common between them that is both of them are made of complicated mechanical components which are like a maze.
As toys of mannish boy, it is a natural sight that there is a reaction between each other. The brands of racing car and wrist watch had cross-sector collaboration to jointly introduce a commemorative watch long ago, which makes men so excited.

1.Rolex & Le Mans
Since 2001, Rolex & Le Mans had been the timing partner in “French 24-hour Le Mans endurance race,” it supplies the provision of official time for the entire race. The brand will present an award called” sprit of Le Mans” which has a special significance, to reward the racing driver who interpret the spirit of 24-hour Le Mans endurance race. The prize is an all-steel Rolex Oyster Perpetual Cosmograph Daytona Watch. It is worth mentioning that the watch back special engraved with “2009 a 24-hour Le Mans endurance race championship,” while the words “Spirit of Le Mans” and the names of the winners are engraved inside of the watchcase.
Daytona wrist watch not only can provide timing but also can accurately calculate the average speed. Watch with a stopwatch plate, central chronograph seconds hand, minutes and hours of time disc controlled by button, as well as a stopwatch to count rate scale the outer ring, is welcomed in the racing events.

2. Blancpain & Lamborghini
Lamborghini is the dream of every car fans, and Blancpain is the world’s oldest watch brand. Combining them what will happen? Blancpain and Lamborghini held the Super Trofeo in this June and the first FIA GT Championship in the famous Adria Speedway in Italy. To celebrate the event, Blancpain launched a special Super Trofeo fly back Chronograph watch. The fly bake function symbolizes fast speed. It is just 300 limited edition watches.
On the black dial of BLANC1 / Super Trofeo fly back chronograph watch, the eye-catching red and white Arabic numeral markers correspond with the numbers of the 30 Gallardo LP560 – 4 super sports car in Lamborghini Blancpain Super Trofeo race.

3. Audemars Piguet & Gstaad Classic
Except for the race of Chariots, Gstaad Classic also has a pivotal position. Because vintage cars have more historical significance.
Audemars Piguet watch factory often participate in various sports. The Gstaad Classic was held in this September. As a partner of this event, Audemars Piguet released a Royal Oak Offshore Gstaad Classic 2009 limited edition watch.
Royal Oak Offshore Gstaad Classic 2009 limited edition watch was engraved “Gstaad Classic 2009″ on case back. Its owns AP caliber 2326/2840 self-winding movement, providing 38 hours power reserve.