The model number of Japanese Seiko watches is often not marked on the watch. It is usually on the hangtag or warranty card. Generally, the name Seiko is in English on the front, and its model number is on the back. Beginning with letters.
If it is a Seiko mechanical watch, you can see the movement number on the pendulum inside the transparent glass behind the watch. Seiko watches are one-card-one, that is, each watch has only one warranty card, and the watch number is on the side of the watch case. It is consistent with the warranty card given to you when you purchased it.
SEIKO 5 on the top of the front indicates that this watch belongs to the Seiko No. 5 Shield series. It is an entry-level mechanical watch, targeting the low-end market. AUTOMATIC tells buyers that this mechanical watch winds automatically and drives the hands to keep time.
21 JEWELS means that there are 21 artificial ruby ??bearings in the mechanical movement.
Extended information:
Seiko watch system classification:
1. Kinetic electric energy
Kinetic electric energy: innovative technology for power generation factory.
Kinetic electric energy is a type of power transmission system like mechanical type and quartz type.
In the past 20 years, SEIKO has launched numerous watch products based on the power transmission system of Kinetic, each of which allows consumers to experience its uniqueness.
As early as the 1986 Basel Exhibition in Switzerland, SEIKO launched the initial trial product of Kinetic, temporarily named "AGM", which was the first in the world at that time. A watch that converts human movement into electrical energy.
After taking this first step, after twenty years of development, now for many users of Kinetic kinetic energy around the world, Kinetic kinetic energy has become an environmentally friendly, high-performance, Synonymous with durability.
Since the first watch was officially launched in 1988 (when the new name AGS was adopted) until today, the cumulative sales of Kinetic electric watches have exceeded 8 million (as of 2007).
In 1998, SEIKO launched Kinetic Auto Relay (automatic electric energy, intelligent time control), which extended the time of the watch's "sleep energy saving" mode to an astonishing four years. The watch can be activated at any time during these four years, causing it to automatically return to the current accurate time.
In 1999, we witnessed the birth of the Ultimate Kinetic Chronograph. This watch combines SEIKO's mechanical and electronic watchmaking technology. The outstanding work of Dacheng; in 2003, another Kinetic Chronograph (human-powered electric chronograph) was launched on the market.
At the Baselworld 2005, the Kinetic Perpetual (perpetual calendar) debuted for the first time, combining the convenience of Kinetic (perpetual calendar) with a long-lasting perpetual calendar that does not require adjustment until 2100. ; In 2007, the crystallization of SEIKO's humanized technology: Kinetic Direct Drive (human-powered, manually rechargeable) was launched.
2. Mechanical type
SEIKO (Seiko) automatic movement 6R20 is a high-standard movement, allowing SEIKO (Seiko) to occupy a solid position in the high-quality mechanical watch market.
All components of the 6R20 movement, with the exception of the rubies, are manufactured by SEIKO Instruments Inc.
The movement is manufactured with precision and includes an engraved oscillating weight. The edges of the automatic rotor splint are polished and most surfaces are hairline polished.
The high-speed (28,800 rpm) movement can achieve an accuracy of -15 to 25 seconds per day. The mainspring made of Spron 510* material generates an energy reserve that enables the watch to operate for more than 45 hours.
3. Quartz type
SEIKO is passionate about watchmaking craftsmanship, and the quartz watches it produces have brought a great revolution to the history of watch development. The quartz watch developed and launched in 1969 subverted the traditional concept of watches and brought revolutionary changes in the watchmaking industry.
A quartz crystal oscillator is installed at the core of this watch to ensure the accuracy of the watch. Crystal cut into a fixed shape has a characteristic that when a voltage is applied to it, the crystal will produce stable vibrations.
The standard model of quartz crystal oscillators, which utilize the electrical properties of the crystal to ensure time speed accuracy, has been well known for many years. However, in order to fully apply the accuracy advantages of quartz crystal to watches, there are still many technical problems that need to be solved on this industry road.
In 1969, SEIKO successfully solved all the problems and launched its first quartz watch product to the world for the first time.
It took 10 years from the time Suwa Seikosha started the quartz crystal oscillator research and development project to the launch of the first quartz watch.
In order to put quartz watches into practical use, SEIKO has created unique technology. For example, the shape of the quartz crystal cut is adjusted to the style of a tuning fork; the signal emitted from the crystal oscillator is better utilized and carried out by developing IC (integrated circuit) and stepper motor (time can run one second) Accurate operation.
In addition, SEIKO (Seiko) has the passion to change the future manufacturing process of watches. It does not monopolize its unique technology on patent issues, but discloses it to the world.
Soon after, many of the technologies provided by SEIKO became watchmaking standards around the world. To this day, these technologies are still contributing to the development of quartz watch manufacturing.
Baidu Encyclopedia_Seiko Watches