Luxury Watch Parts Introduction ~ "Movement" Variations ~ Grand Seiko Edition

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Today we will be introducing luxury watch parts: "Movement" variations - Grand Seiko .

Luxury watch movements are made by hand by craftsmen combining hundreds of parts, and there are numerous variations, ranging from simple two-hand movements to ultra-complex mechanisms such as perpetual calendars and tourbillons.Moreover, they do not merely perform their functions, but many are finished so beautifully that they are worthy of being called works of art, and many people are impressed by their beauty and consider purchasing one.

Therefore, over several posts, I would like to introduce the main movements of each brand along with their representative models.

This time, we will introduce the main movements used in " Grand Seiko ". Please enjoy until the end.

Introducing the movement

①Cal.9R01

Cal.9R01
Specifications
diameter 37.0mm thickness 4.1mm
Frequency - Year of release 2016
Number of jewels 56 pieces Drive system Hand-wound Spring Drive
composition 3 hands + power reserve indicator Power reserve Approximately 192 hours
Features of the “Cal.9R01”
The first Grand Seiko to be produced by Micro Artist Studio, a specialist workshop that produces complicated watches and top-of-the-line products based on the Spring Drive movement .
- By arranging three barrels in series, three times the power source is secured, achieving a maximum power reserve of approximately eight days (approximately 192 hours).
Representative model
・"Masterpiece Collection" "Ref.SBGD201"
・"Masterpiece Collection" "Ref.SBGD213"

*Source: https://www.grand-seiko.com/jp-ja/collections/sbgd201

*Source: https://www.grand-seiko.com/jp-ja/collections/sbgd213

➁Cal.9R02

Cal.9R02
Specifications
diameter 37.0mm thickness 4.0mm
Frequency - Year of release 2019
Number of jewels 39 pieces Drive system Hand-wound Spring Drive
composition 3 hands + power reserve indicator Power reserve Approximately 84 hours
Features of the “Cal.9R02”
- Equipped with a Spring Drive movement that uses a mainspring as a power source to rotate the rotor, converting that kinetic energy into electrical energy, and drives a quartz oscillator with a small amount of power generation.
- The dual spring barrel using two power springs, combined with a unique torque return system, ensures a power reserve of approximately 3.5 days (approximately 84 hours).
Representative model
・"Masterpiece Collection" "Ref.SBGZ009"

*Source: https://www.grand-seiko.com/jp-ja/collections/sbgz009

➂Cal.9R65

Cal.9R65
Specifications
diameter 30.0mm thickness 5.1mm
Frequency - Year of release 2003
Number of jewels 30 pieces Drive system Automatic Spring Drive
composition 3 hands + date + power reserve indicator Power reserve Approximately 72 hours
Features of “Cal.9R65”
-The automatic winding Spring Drive movement was developed over a period of four years since the launch of Spring Drive in 1999.
・By adopting the company's unique Magic Lever system, developed in 1959, productivity, maintainability, and durability have been improved. 9R is the most standard caliber for Spring Drive and is installed in many models.
Representative model
・Heritage Collection "Ref.SBGA387"

*Source: https://www.commit-watch.co.jp/buyer/watches/mens/grand-seiko/heritage-collection-256922/

➃Cal.9RA5

Cal.9RA5
Specifications
diameter 34.0mm thickness 4.8mm
Frequency - Year of release 2020
Number of jewels 38 pieces Drive system Automatic Spring Drive
composition 3 hands + date + power reserve indicator Power reserve Approx. 120 hours
Features of the “Cal.9RA5”
- Approximately 0.8mm thinner than conventional models
- The "dual-size barrel", which has two barrels of different sizes arranged side by side, provides a power reserve of approximately five days (approximately 120 hours).
- By moving the crown as close as possible to the case back and lowering the watch's center of gravity, an excellent fit is achieved.
Representative model
・"Sports Collection" "Ref.SLGA001"

*Source: https://www.commit-watch.co.jp/buyer/watches/mens/grand-seiko/spring-drive-201067/

⑤Cal.9RA2

Cal.9RA2
Specifications
diameter 34.0mm thickness 4.8mm
Frequency - Year of release 2020
Number of jewels 38 pieces Drive system Automatic Spring Drive
composition 3 hands + date + power reserve indicator Power reserve Approx. 120 hours
Features of the “Cal.9RA2”
-The power reserve display of the "Cal.9RA5" is located on the case back.
- Equipped with an IC called "SOI-IC" that operates with a very small current consumption, the temperature sensor measures the temperature inside the watch 540 times a day to determine the effects of temperature and automatically corrects errors in the vibration frequency.
Representative model
・"Evolution 9 Collection" "Ref.SLGA009"

*Source: https://www.commit-watch.co.jp/buyer/watches/mens/grand-seiko/evolution9-248200/

⑥Cal.9S85

Cal.9S85
Specifications
diameter 28.4mm thickness 5.9mm
Frequency 36,000 vibrations Year of release 2009
Number of jewels 37 pieces Drive system Automatic
composition 2 hands + date Power reserve Approximately 55 hours
Features of the “Cal.9S85”
- The first high-beat specification in approximately 40 years, with 36,000 vibrations.
・It took about six years to develop the main spring “Sprong 530,” and about five years to develop the hair spring “Sprong 610.”
Representative model
・Heritage Collection "Ref.SBGH315"

*Source: https://www.commit-watch.co.jp/buyer/watches/mens/grand-seiko/heritage-collection-325384/

⑦Cal.9S86

Cal.9S86
Specifications
diameter -mm thickness -mm
Frequency 36,000 vibrations Year of release -
Number of jewels 37 pieces Drive system Automatic
composition 3 hands + date + GMT Power reserve Approximately 55 hours
Features of the “Cal.9S86”
- The watch retains the performance of the 36,000 vibration high-beat movement "Caliber 9S85" while adding a GMT function.
-Uses advanced technology called MEMS (Micro Electro Mechanical Systems), which can manufacture and process lightweight parts with a precision of 0.001 mm .
Representative model
・"Mechanical Hi-Beat 36000 GMT" "Ref. SBGJ237"

*Source: https://www.commit-watch.co.jp/buyer/watches/mens/grand-seiko/mechanical-hi-beat-36000-253701/

⑧Cal.9S65

Cal.9S65
Specifications
diameter 28.4mm thickness 5.9mm
Frequency 28,800 vibrations Year of release 2010
Number of jewels 35 pieces Drive system Automatic
composition 3 hands + date Power reserve Approximately 72 hours
Features of the “Cal.9S65”
-Introduced as the successor movement to "Cal.9S55".
-Uses MEMS (Micro Electro Mechanical System) technology.
- Winding efficiency has been improved by changing the winding method to a reverser method.
Representative model
・Heritage Collection "Ref.SBGR325"

*Source: https://www.grand-seiko.com/jp-ja/collections/sbgr325

⑨Cal.9SA5

Cal.9SA5
Specifications
diameter 31.6mm thickness 5.1mm
Frequency 36,000 vibrations Year of release 2020
Number of jewels 47 pieces Drive system Automatic
composition 3 hands + date Power reserve Approximately 80 hours
Features of the “Cal.9SA5”
-The first 9S mechanical movement to feature an "instant date change mechanism".
-By adopting a new structure called "horizontal gear train structure", it has become possible to make the watch approximately 0.8mm thinner than the "Cal.9S85".
Representative model
・"Evolution 9 Collection" "Ref.SLGH011"

*Source: https://www.commit-watch.co.jp/buyer/watches/mens/grand-seiko/evolution-9-collection-346337/


⑩Cal.9STI

Cal.9STI
Specifications
diameter 35mm thickness 7.98mm
Frequency 28,800 vibrations Year of release 2022
Number of jewels 44 pieces Drive system Manual winding
composition 3 hands + power reserve indicator + tourbillon + constant force Power reserve Approximately 72 hours
Features of “Cal.9STI”
・Grand Seiko's first tourbillon and skeleton watch equipped with a constant-force (remontoire) mechanism.
- The "T0" concept movement, developed by Takuma Kawauchiya's team over a period of five years, has been improved and miniaturized and will be released in 2022.
Representative model
・Kodo Constant Force Tourbillon "Ref.SLGT003"

*Source: https://www.grand-seiko.com/jp-ja/news/20220330-1

summary

What did you think.

We have introduced various movements, but when it comes to Grand Seiko, the first thing that comes to mind is the unique Spring Drive mechanism. I believe that the Japanese temperament is the reason why this revolutionary movement, which uses a mainspring as a power source like mechanical watches but uses a quartz oscillator like quartz watches to control the precision of the watch, was born. We would like to keep an eye on the future developments of Grand Seiko, which has technical capabilities that set it apart from other brands. Why not take this opportunity to look for your favorite watch by paying attention to movements that don't often get much attention?

Once again, we hope this article helps you find your favorite luxury watch.

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