Side by side

AVI-8 Flyboy Airmaster GMT AutomaticvsSugess MoonPhase Master S437

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

Flyboy Airmaster GMT Automatic
AVI-8Flyboy Airmaster GMT Automatic
MSRP $365
MoonPhase Master S437
SugessMoonPhase Master S437
MSRP $549

At a glance

12 of 29 specs differ
Diameter
Flyboy Airmaster GMT Automatic40mm
MoonPhase Master S43740mm
Power Reserve
Flyboy Airmaster GMT Automatic40h
MoonPhase Master S43748h
Water Resistance
Flyboy Airmaster GMT Automatic50m
MoonPhase Master S43750m
MSRP
Flyboy Airmaster GMT Automatic$365
MoonPhase Master S437$549

Full specifications

Case

6 specs
Category
GMT
Chronograph
Thickness
13.5mm
Lug-to-Lug
47.8mm
Lug Width
22mm
Material
316L Stainless Steel
Stainless Steel/Rose Gold
Caseback
Solid
Display

Crystal & Dial

2 specs
Dial Color
Black
White
Lume
None
X1

Movement

3 specs
Caliber
NH34
ST2528
Power Reserve
40h
48h
Complications
None
Moonphase, Date

Pricing

1 specs
MSRP
$365
$549

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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.

AVI-8 Flyboy Airmaster GMT Automatic

Owners widely praise the AVI-8 Flyboy Airmaster GMT Automatic for its robust build quality, intricate three-timezone function, and crisp dial texture. The watch is noted for its wearable 41mm case size and 48.5mm lug-to-lug, with an internally positioned GMT complication that maintains a clean dial appearance. Some owners report the stock leather strap feels cheap and limits strap changing options. On balance, owners rate the AVI-8 Flyboy Airmaster GMT Automatic highly for its solid finishing and value, particularly highlighting the dial's depth and texture.

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.

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