Grand Seiko Finally Drops the Dive Watch Fans Have Been Waiting For

If Grand Seiko has had a blind spot, at least as far as fans are concerned, it is dive watches. One of Seiko’s most revered categories has been underserved by its top-tier sub-brand for years.

That changes now with the debut of the Ushio 300 Diver. Perfectly sized at 40mm and powered by one of the most advanced automatic watch movements on the planet, it is the Grand Seiko diver we’ve all been waiting for.

Grand Seiko

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The Ushio, which means “tide” in Japanese, is significantly smaller in both width and height than the existing SBGH Hi-Beat collection, the brand’s primary diver for years.

The case measures a fraction over 40mm wide and 13mm high, and is made of the proprietary High-Intensity Titanium, which is 30-percent lighter than steel and maintains a lustrous tone.

Despite its smaller size, it offers 300m of water resistance, which tops its predecessor by 100m.

Grand Seiko

The chamfered case features a long, sloped crown guard that runs lug-to-lug, protecting the fluted, signed crown.

It is presented on Grand Seiko’s new micro-adjustable High-Intensity Titanium three-link bracelet with an added locking mechanism on the folding clasp. The brand logo slides to unlock the clasp, preventing accidental removal while diving.

A high tide mark

Along with improved specs, the Ushio 300 Diver debuts a new dial for Grand Seiko. The hands are simplified, with the fountain pen hour hand replaced by a new version of the Evolution 9 hour hand, and the arrow minute hand is more pointed.

Only the seconds hand, with the lume dot lollipop counterbalance, remains unchanged.

Grand Seiko

The hour markers are now all rectangular, which resembles the 62MAS. They are fitted with the same green-emitting Lumibrite as the hands.

A silver dash of minutes/seconds track runs along a sizable reahut, which is color-matched to the dial and bezel.

While there is no date complication, Grand Seiko’s new diver is equipped with the brand’s standard dial power reserve indicator.

Grand Seiko

The dial plate is decorated with Grand Seiko’s Ushio texture, which resembles waves on the sea and fades from light at the center to darker around the outside rim.

The Ushio 300 Diver debuts with blue and green dial options. Both are equipped with matching ceramic bezel inserts featuring fully graduated 60-minute countdown tracks and lume pips.

An ultra fine diver

As nice as the new size and dial are, where the Ushio 300 Diver really blows away its aquatic predecessors is the movement. Grand Seiko equipped it with the newest generation of its UFA Spring Drive movement.

The Caliber 9RB1 is accurate to within 20 seconds per year and provides a 72-hour power reserve.

Grand Seiko

The cutting-edge movement is well protected behind a screw-on High-Intensity Titanium caseback, decorated with Grand Seiko’s lion logo in relief

Availability and pricing

The Grand Seiko Ushio 300 Diver will be available in June 2026 for $12,400.

Grand Seiko

Grand Seiko Ushio 300 Diver

Specs

Case Size	40mm
Movement	Grand Seiko Caliber 9RB1 UFA Spring Drive
Water Resistance	300m

• $12,400 at Grand Seiko

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