Side by side

Sugess MoonPhase Master S437vsGrand Seiko SBGM221

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

MoonPhase Master S437
SugessMoonPhase Master S437
MSRP $549
SBGM221
Grand SeikoSBGM221
MSRP $5,400

At a glance

15 of 29 specs differ
Diameter
MoonPhase Master S43740mm
SBGM22139.5mm
Power Reserve
MoonPhase Master S43748h
SBGM22172h
Water Resistance
MoonPhase Master S43750m
SBGM22130m
MSRP
MoonPhase Master S437$549
SBGM221$5,400

Full specifications

Case

8 specs
Category
Chronograph
GMT
Diameter
40mm
39.5mm
Thickness
13.5mm
13.7mm
Lug-to-Lug
47.8mm
46.9mm
Lug Width
22mm
19mm
Material
Stainless Steel/Rose Gold
Stainless Steel
Water Resistance
50m
30m
Caseback
Display
Solid

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
White
Black
Lume
X1
None

Movement

3 specs
Caliber
ST2528
9S66
Power Reserve
48h
72h
Complications
Moonphase, Date
None

Pricing

1 specs
MSRP
$549
$5,400

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Sugess MoonPhase Master S437

Owners widely praise the Sugess MoonPhase Master S437 for its striking dial, often described as deep blue or aventurine, and its value, with prices around $171-$175. The Seagull ST1908 movement is noted as accurate, with one owner reporting +3 seconds over 18 hours and another +7 seconds daily, and its hand-winding action is smooth. However, the watch's thickness, potentially over 13mm, is a concern for some as a dress watch, and the long lugs may pose a fit issue on smaller wrists. A potential design flaw in the moonphase window, showing two phases simultaneously, is flagged as a deal-breaker by some. The included leather straps are considered stiff and uncomfortable, and the domed sapphire crystal lacks AR coating, leading to reflections. On balance, owners rate the Sugess MoonPhase Master S437 highly for its stunning dial and value, despite some fit and finishing concerns.

Grand Seiko SBGM221

Grand Seiko SBGM221 is widely praised for its exceptional dial finish, highly polished hands and indices, and elegant design. Owners consistently highlight the stunning craftsmanship, with specific mention of the up to 11 hand-polished facets on its rectangular markers. The reliable 9S66 movement is noted for its 72-hour power reserve and true GMT functionality, tested beyond Chronometer specifications. Some enthusiasts desire a bidirectional 24-hour bezel, which the Grand Seiko SBGM221 lacks, and its 13.7mm thickness and 19mm lug width are noted as potential limitations. On balance, owners rate the Grand Seiko SBGM221 highly for its exquisite finishing and elegant, comfortable design.

From video reviewers

The SBGM221 is praised for its value within the Grand Seiko lineup. The lug width is cited as a weakness.

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