Key Takeaways
1. Grand Seiko introduces the SBGX359 and SBGX361, the smallest and thinnest watches in the 9F quartz movement line with a 33.0 mm case and 9.1 mm thickness.
2. The new models feature the Caliber 9F51 movement, offering an accuracy of ±10 seconds per year and includes advanced features like a Twin Pulse Control Motor.
3. The SBGX359 has a “Snowflake” dial with a textured white finish, while the SBGX361 features a “Skyflake” dial with a light blue hue and snow-like texture.
4. Both watches are protected by sapphire crystals and are priced at $3,200 USD.
5. The SBGX359 and SBGX361 will be available globally starting in April 2026.
Grand Seiko has made a big announcement about a new size standard for its Heritage Collection, introducing the SBGX359 and SBGX361. These watches are crafted with a 33.0 mm stainless steel case that is only 9.1 mm thick. This makes them the tiniest and thinnest cases ever created for the 9F quartz movement line. This launch brings high-quality textured dials, usually found on larger Spring Drive watches, into a more compact form that should fit nicely on smaller wrists.
Movement and Accuracy
The new models are equipped with the innovative Caliber 9F51, which boasts an accuracy of ±10 seconds per year. While it keeps the basic design of the 9F series that was first introduced in 1993, the 9F51 has a diameter that is 0.6 mm smaller than the Caliber 9F61. This reduction is key to achieving the 9.1 mm case thickness without losing any performance. The movement also includes a Twin Pulse Control Motor for strong hand movement and a backlash auto-adjust feature to ensure the seconds hand is perfectly aligned.
Unique Dial Designs
In terms of design, this collection showcases two distinct dial finishes that draw inspiration from the Nagano landscape near the Shinshu Watch Studio. The SBGX359 features a “Snowflake” dial, which has a textured white finish created through a specific silver-plating and clear-coating method, paired with a tempered blue seconds hand. On the other hand, the SBGX361 sports a “Skyflake” dial with a light blue hue and a snow-like texture. Both watches are protected by sapphire crystals and are priced at $3,200 USD. They will be available globally starting in April 2026.
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