Editorial
At 37.3mm, the SBGW231 is the smallest Grand Seiko you can buy new, and it makes a case that restraint is its own kind of ambition. The silver dial is quiet in the best way: applied indices, a seconds hand, nothing else competing for attention. Wind it every morning and it rewards you with one of the finest hand-wound experiences in watchmaking at any price.
Grand Seiko introduced the SBGW231 in 2017 as part of the Heritage Collection, drawing directly on the proportions and philosophy of the original 1960 Grand Seiko. The 9S64 caliber was developed in-house specifically for hand-wound Grand Seikos, running at 36,000 vph with a power reserve of approximately 72 hours. At a time when the industry default had drifted toward 40mm and larger, the 37.3mm case was a deliberate signal that GS understood its own collector base.
The zaratsu case-finishing technique, which Grand Seiko has practiced since the 1960s, reads most clearly at this size: the transitions between polished and brushed surfaces are sharper and the geometry more precise than on larger cases where the same finishing can look softer. The SBGW231 sits at the entry point of the Heritage Hand-Wind line, but in terms of craft per dollar it punches well above its position.
The silver dial photographs cooler than it looks in hand; in natural light it has a warmth and depth that images rarely capture, so do not judge this reference from photos alone. Crown placement is at 3 o'clock with no screw-down lock, and because the 9S64 is hand-wound only, daily winding is required. Buyers who forget to wind or prefer the convenience of automatic movements should look elsewhere in the Heritage line.
Water resistance is 30 meters, which is standard for a dress watch of this type but means you should treat it accordingly. Case thickness is 10.7mm, which is moderate rather than slim; under a dress shirt cuff it sits a touch higher than a comparably sized Swiss dress watch would. Early examples from 2017 and 2018 show no known quality issues, but service intervals on the 9S64 are recommended at around three to five years for collectors who wear the watch daily.
