Brillier Mono Mechanical Blue Dial Automatic with Moon Phase and Big DatevsGrand Seiko SBGR321
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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.

Mono Mechanical Blue Dial Automatic with Moon Phase and Big Date

SBGR321
Diameter
43mm
40mm
Lug-to-Lug
n/a
46.6mm
Thickness
14mm
13mm
lowest
Water Resistance
n/a
100m
Power Reserve
n/a
72h
MSRP
$795
lowest
$5,200
Movement
Automatic
Grand Seiko 9S65
Case
5 specsCrystal & Dial
1 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners praise the Brillier Mono Mechanical Blue Dial Automatic Watch with Moon Phase and Big Date for its clean, symmetrical blue dial with legible indices and a navy blue pointer date. One owner found it a good value for a Swiss-made automatic moonphase around $600 on the gray market. However, one owner reported the metal bracelet and included leather strap felt cheap and of poor quality, noting the absence of adjustment tools and a manual. On balance, owners rate the Brillier Mono Mechanical Blue Dial Automatic Watch with Moon Phase and Big Date highly for its attractive dial and value proposition as a Swiss-made automatic moonphase.
Owners and reviewers widely praise the Grand Seiko SBGR321 for its attractive design, compelling 40mm dimensions, and exceptional finishing, particularly the sharp lines and contrasting brushing and polishing on the steel case. The sunburst blue dial, inspired by the dawn sky, is a consistent highlight, featuring applied markers and hands that showcase Grand Seiko's signature craftsmanship. The robust 9S65 automatic movement is reported to run within specifications, with one source noting a precision rate of +5 to -3 seconds per day and a 3-day power reserve. The watch also features a display caseback revealing a blue rotor with a crimson rim, inspired by Mount Iwate. On balance, owners and reviewers rate the Grand Seiko SBGR321 highly for its exquisite finishing and compelling blue dial at the price point.
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