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You are here: Home / Families / Seiko 9SA Family

Seiko 9SA Family

Last Update: March 5, 2020

BRANDS: Grand Seiko, Seiko, Shizukuishi Watch Studio

Production: 2020 – Current
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Introduced in 2020, the 9SA family of movements are the next generation “Hi-Beat” movement from Grand Seiko. Following on the Seiko 9S8 family of Hi-Beat movements, this family includes numerous improvements, including an 80 hour power reserve. Other advances include a new dual-impulse escapement, the implementation of a free-sprung balance, and a redesigned horizontal gear train.

Seiko introduced a next-generation Hi-Beat movement in the 2020 SLGH002 60th Anniversary model

Specifically, Seiko highlights the following advances in the 9SA series:

The 9SA movements feature a double-impulse escapement and new free-sprung balance
  1. Dual Impulse Escapement – Seiko’s new escapement features a three-pointed anchor similar to the George Daniels/Omega Coaxial or Audemars Piguet three-pallet escapement. This transmits power directly to the balance in one direction and through the pallet fork in the other. These components are manufactured using MEMS technology for extreme precision.
  2. Free-Sprung Balance – Seiko adopts a free-sprung balance with an overcoil, similar to those used by other high-end watchmakers. The shape is unique to Seiko. The balance wheel also has a new square notched profile with square headed screws for adjustment.
  3. Horizontal Gear Train – The gear train was redesigned to place all components on the same plane, resulting in a slimmer profile. The movement also adopts a balance bridge design not previously seen in a Seiko calibre.

Seiko 9SA Family

The 9SA family movements operate at 36,000 A/h (10 Hz) yet achieve 80 hours power reserve thanks to precision materials and a novel double-impulse escapement. This escapement, similar to George Daniels famed Coaxial design, is paired with a free-sprung balance, a first for Grand Seiko. The movement wheel train is entirely new as well, designed so all of the gears sit are in a single plane, reducing movement thickness. This is possible thanks to a larger 31.86 mm diameter, up from 28.40 mm in previous Grand Seiko movements.

CalibreJewelsFunctionsModels
Cal. 9SA547DateSLGH
Calibre Start Year End Year Diameter (mm) Diameter (ligne) Height (mm) Complications
Seiko 9SA5 2020 Current 31.86 14 5.18 Date, Hacking Seconds, Hand Winding, Quick Date Correction

Seiko 9SA5

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