Audaz Reef DivervsGrand Seiko SBGH289
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Reef Diver

SBGH289
Diameter
45mm
43.8mm
Lug-to-Lug
53mm
51mm
lowest
Thickness
15.5mm
14.7mm
lowest
Water Resistance
300m
highest
200m
Power Reserve
n/a
55h
MSRP
$420
lowest
$7,700
Movement
Seiko NH35
Grand Seiko 9S85
Case
5 specsCrystal & Dial
3 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Audaz Reef Diver is a bold, rugged tool watch with a focus on clarity and accuracy for diving. It features a 45mm 316L stainless steel case, sapphire crystal, Super-LumiNova C3, and 300m water resistance. One owner notes it is a large, heavy watch. The Audaz Reef Diver is available with a Seiko NH35 automatic movement starting at $269. On balance, owners and reviewers view the Audaz Reef Diver positively for its dependable tool-watch design and robust specifications at its price point.
Grand Seiko SBGH289 owners and reviewers praise its legible blue dial, strong Lumibrite, and the smooth sweep of its Hi-Beat Caliber 9S85 movement. The watch's steel case is noted for its comfortable wearability despite its 43.8mm size, and it features Grand Seiko's Super-Hard Coating for scratch resistance. Accuracy is reported within +8/-1 seconds per day. Overall, owners and reviewers rate the Grand Seiko SBGH289 highly for its blend of legibility, comfortable wear, and the precise, smooth-sweeping high-beat movement.
Excellent finishing and smooth bezel action are notable features of the Grand Seiko SBGH289. A weakness of the watch is the relatively low lume brightness. Reviewers disagree on the watch's ideal lug width, with some considering 22mm a limitation for users who prefer a more standard 20mm or 21mm strap width, while others do not mention this as a concern.
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