Editorial
The SBSA001 is the Japanese-market answer to the SKX's discontinuation: a 42.5mm automatic diver that picks up where that cult classic left off, without pretending to be something it isn't. You get a legitimate tool watch at an honest price, built around a movement Seiko has refined for decades.
Seiko killed the SKX007 in 2019 after more than two decades in production, leaving a gap in the affordable automatic diver segment that the brand immediately moved to fill with a relaunched 5 Sports lineup. The SBSA001 is the domestic Japanese version of that relaunch, sold through Seiko's home-market channels while the SRPD series covered international distribution. Both share the same SKX-inspired case proportions and crown-at-4 layout, but the SBSA001 carries Japanese-market finishing standards and packaging.
The day-date complication via the 4R36 caliber gives it slightly more daily utility than a pure three-hand diver. It arrived at a moment when used SKX prices were already climbing on nostalgia demand, and the 5 Sports line became the rational alternative for buyers who wanted the spirit of the SKX at a current-production price.
The 4R36 hacks but does not hand-wind, which is a genuine inconvenience when setting time precisely. At 42.5mm with the crown at 4, the case wears larger than its diameter suggests, and buyers with smaller wrists should try it before committing. The bezel insert on early production SBSA001 units can show uneven lume application; inspect under a light before purchase.
The crystal is Hardlex, not sapphire, so scratching is a matter of when, not if. Gray-market units sold as SBSA001 are sometimes actually SRPD variants with the dial legend altered, so confirm the reference number on the caseback matches the paperwork.
