Brand :Grand Seiko
Range :Grand Seiko Sport GMT
Case material :Stainless Steel with ceramic
Case size :40.5 mm
Case Thickness :14.7 mm
FUNCTIONS :Hours, Minutes, Seconds, Date, GMT, Power Reserve, Rotating Bezel
The case shape :Round
Bracelet material :Stainless Steel
Dial colour :Black
BUCKLE :Deployment Buckle
WATER RESISTANCE :200 m
Seiko SLGA001 60th Anniversary Limited Edition
Lighter, more precise, and more powerful. The new Spring Drive movement marks a new beginning for Grand Seiko.
Before creating Spring Drive, the choice was absolute. You either choose a mechanical watch and enjoy its traditional features and autonomy, but can tolerate its relative imprecision, or the accuracy of the electronic watch you wear has increased tenfold, but it requires a battery. In 1999, Spring Drive solved this problem by combining the best of the two existing watch technologies into a watch driven by a mainspring, which provides an accuracy of one second per day. Back then, and now, Spring Drive has been one of the biggest advancements in the watch industry.
Today, for two decades, Grand Seiko has introduced a new generation of Spring Drive movement, which is slimmer, more precise and has a greater power reserve. The 9RA5 movement took Spring Drive technology to a new level and opened a new era in the history of Grand Seiko.
Performance improvement in all aspects
The goal is ambitious. The Grand Seiko team’s goal is to make a Spring Drive watch that will set new standards for any spring-powered watch in terms of size, performance and functionality.
Their creation movement 9RA5 does exactly that. Compared with the mainstream 9R6 movement in the current series, the 9RA5 movement has a power reserve of 5 days, an increase of 60%. Its monthly accuracy has risen from ±15 seconds per month to ±10. The moving depth is reduced from 5.8mm to 5.0mm, and the date change speed is greatly improved.
The slim profile of the 9RA5 movement is achieved by redesigning and repositioning the magic handle. Magic Lever was internally developed in 1959. It uses the energy generated by the movement of the pendulum in two directions to improve the efficiency of the automatic winding mechanism. In the new movement, the position of the new offset magic lever is far from the center of the movement to reduce the thickness of the movement. Significantly, this is achieved without loss of winding efficiency. The rod and crown are also placed towards the back of the case to lower the center of gravity and achieve a comfortable wrist fit.replica watches review
Although the 9RA5 movement is slim, it has increased rigidity and impact resistance due to the new layout of the gear train towards the movement and the central bridge that holds them together. The impact resistance of the integrated center bridge has reached the ISO standard for diving watches.
The movement contains two barrels and provides a power reserve of up to 120 hours. They vary in size to provide the torque required for a five-day power reserve while optimizing the use of the limited space in the movement.
New IC package provides higher accuracy
The monthly accuracy of the 9RA5 movement is ±10 seconds, thanks to the new IC package and the choice of a highly stable quartz oscillator after a three-month aging process. In a spring-driven movement, the IC integrates a sensor for the first time to measure the temperature inside the movement and is programmed to compensate for any errors in the crystal oscillation rate that may be caused by temperature changes. The oscillator and sensor are vacuum sealed in a separate package to eliminate the slightest temperature difference between the two, and the shield also reduces the possible influence of humidity, static electricity or light interference, thereby keeping the accuracy of the watch at The highest level.
Movement inspired by nature, form and function
Like all Spring Drive movements, the second hand of 9RA5 moves in a perfect sliding motion and shows a natural and continuous flow of time through it, which resonates deeply with Japanese emotions. The movement also has a unique Japanese aesthetic when it is finished, inspired by the natural environment of the production studio. The jewels echo the glittering stars, which are particularly shining in the surrounding mountains in early winter. The delicate texture of the surface of the movement reflects the frost that winter brings to the trees.
Caliber 9RA5 makes its debut in a professional diving watch
In order to demonstrate its power, strength and precision, the first product equipped with Calibre 9RA5 is a professional diving watch. It is resistant to helium and water, and can deal with saturation diving challenges up to 600 meters deep. The cheap watch case is made of high-strength titanium, which is 40% lighter than steel and is not easy to scratch. The power reserve is located at 10 o’clock, and the indicator is divided into five parts to accurately and clearly show how many days of power are left. The case, crystal and bezel are all specially designed to be easily and safely disassembled for maintenance required by professional divers. This is a high-performance watch with a new movement worthy of power.
This watch comes in a special Grand Seiko 60th anniversary watch box with an interchangeable blue silicone strap.
Sport Collection Grand Seiko 60th Anniversary Limited Edition Professional Diver 600M Reference: SLGA001
Grand Seiko SLGA001 product features:
Spring Drive 5 Day Calibre 9RA5
Drive system: automatic
Power reserve: 5 days (120 hours)
Accuracy: +/- 0.5 seconds per day (+/- 10 seconds per month)
Number of jewels: 38
Diameter: 34.0mm, thickness: 5.0mm
High-strength titanium case and bracelet
High definition sapphire crystal
Screw-in crown, back of case
Waterproof: 600m saturation diver’s magnetic resistance
Diameter: 46.9mm, thickness: 16.0mm
Tri-fold buckle with button release, safety lock and extender