Side by side

AVI-8 Flyboy Airmaster GMT AutomaticvsYema Skin Diver CMM.20

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
Skin Diver CMM.20
YemaSkin Diver CMM.20
MSRP $2,372

At a glance

9 of 29 specs differ
Diameter
Flyboy Airmaster GMT Automatic40mm
Skin Diver CMM.2039.5mm
Power Reserve
Flyboy Airmaster GMT Automatic40h
Skin Diver CMM.2040h
Water Resistance
Flyboy Airmaster GMT Automatic50m
Skin Diver CMM.20200m
MSRP
Flyboy Airmaster GMT Automatic$365
Skin Diver CMM.20$2,372

Full specifications

Case

6 specs
Category
GMT
Diver
Diameter
40mm
39.5mm
Thickness
11.5mm
Lug-to-Lug
47mm
Lug Width
20mm
Water Resistance
50m
200m

Crystal & Dial

1 specs
Crystal
Sapphire
Domed Sapphire

Movement

1 specs
Caliber
NH34
Yema CMM.20

Pricing

1 specs
MSRP
$365
$2,372

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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.

Yema Skin Diver CMM.20

Owners and reviewers widely praise the Yema Skin Diver CMM.20 for its vintage aesthetic, 39mm-39.5mm case size, and the in-house CMM.20 micro-rotor movement. The watch features a textured cream dial, sharp applied indices, and a satisfyingly over-engineered push-to-turn bi-directional bezel. The fully brushed bracelet with toolless micro-adjust clasp is highlighted as a significant improvement, though some note its extended lug-to-lug may challenge smaller wrists. Accuracy figures range from -3/+7 seconds per day to erratic results between 0 and -10 seconds per day, with a 70-hour power reserve. Some owners express concerns about the brand's QC reputation and the micro-rotor movement's performance, while one reviewer noted questionable finishing on a prototype's hour hand and a rattly clasp. Overall, owners and reviewers rate the Yema Skin Diver CMM.20 highly for its vintage styling and improved bracelet at the price.

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