Valjoux 7750 came out at 1974 and became the proud model of ETA. Over the years, it has been common in various brands of self-winding chronographs and complex menus. The standard 7750 is equipped with 17 rubies, which can be stored for 42 hours and vibrate 28800 times per hour. One-way winding design is adopted, the pointer fine-tuning device with the same principle as eccentric screw is used, and there is scale indication, which is convenient for fine-tuning operation.
Some people say that ETA-7750 is a dead wood. I don't know why, maybe 7750 is a little general in its technological intention, but one thing remains the same: simplicity is durable, and durability is reliable. ETA-7750 is such a chronograph movement. ETA-7750 adopts push rod timing structure, which is simple and easy to maintain. Aesthetics is certainly not as good as Langdong 100 1 (different from Santana and Mercedes-Benz), but it is indeed one of the best schemes in terms of timing function.
The whole watch industry should thank the existence of ETA-7750, because with it, more watch factories can produce chronograph watches. And you can avoid all the expenses of developing your own timing core. How to identify ETA-7750 with the simplest method? At 6 o'clock, 9 o'clock, 12 o'clock, 99% of the small plates are ETA-7750, but this cannot be said the other way around.
2.2892 movement
ETA2892A2 is now used by most high-end brands, including Wanguo, Omega and Longines. (Click to view: watches and styles of Gao Dun Watch City 2892 movement)
Well-known middle-priced brands are often used in high-end watches, especially timepieces, and even some brands in high-end watches are also in use, but they pay more attention to polishing and carving, or replace them with K-gold or pure white gold automatic discs.
2892 is recognized by all watchmakers as one of the most precise and stable ETA models. Equipped with ring balance wheel, 2 1 stone, two-way automatic winding, vibrating 28800 times per hour, and "eccentric screw trimmer" for convenient and precise fine adjustment. Because of its good quality, it can be transformed into a well-designed movement with a little modification. The popular Omega coaxial escapement watch is also a movement modified from 2892 to 1 120. Astronomical watches, such as ULYSSE NARDIN's chronograph trilogy suit, also take 2892 as the basic movement, and become super-small and complex astronomical watches, which can be called the greatest masterpiece of Athens watches.
However, ETA2892A2 also has some shortcomings, that is, the winding efficiency, which is an inherent problem of ETA2892A2, but it can be made up by appropriate changes. For example, Omega Cal 1 120 changes the three screws on the automatic bracket into eccentric fixing, changes the shape of the automatic bracket, and moves the center down.
3, 2824 movement
And ETA 2892-A2 and ETA 7750 are listed as one of the three treasures of ETA. (Click to view: watches and styles of Gao Dun Watch City 2824 movement)
ETA2824-2 is stable and accurate, and has the function of manual winding. Although the price is higher than Japanese sports, it is still the first choice for beginners in all aspects. But the price is low, so it becomes a fake watch, the so-called Taiwan Province watch, the preferred movement of Hongkong watch, which leads to excessive proliferation.
If ETA2892-A2 is customized for the high-end market, then ETA2824-2 is specially designed to meet the darling of the low-end market.
4.6497 Movement
In the past, 6497 was not easy to use because of its large size. . (Click to view: watches and styles of 6497 movement in Gao Dun Watch City)
The wind and water have turned, and the 6497 has ushered in its own spring-the popularity of large watches has arrived, and the size of the 6497 just caters to the needs of almost all large watch cases.
Because of its huge volume and reasonable structure, the accuracy of 6497 is surprising again. Although it is only a low-frequency pendulum of 18000A/H, it can easily pass COSC certification and beat many small high-frequency movements out of the water.
Also related to 6497 is Omega's iron watch, which was once designed for railway workers to keep accurate time. The huge case is loaded with the 6497' s twin brother, the 6498 movement-only a small change was made in the position of the small second hand, and the original 9 o'clock second hand was changed to the traditional 6 o'clock second hand.
5,7001movement
ETA700 1 mainly meets the field of small-caliber watch movements.
Its appearance makes it possible for many manufacturers who can't or don't want to develop their own movements to produce small three-pointer watches. Because it was designed and manufactured in 197 1, the influence of 2660, 269 1 and 280 1 before and after it is not as big as 700 1, because the size of 700 1 is far away. NOMOS, one of the three major brands in Germany, made a big splash with it.