AVI-8 Flyboy Airmaster GMT AutomaticvsSeiko 5 Sports Field series

lug2lug doesn't sell watches. Buy links open the brand's or seller's own site. Some links are affiliate links: lug2lug may earn a commission at no extra cost to you. Disclosures

Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

AVI-8 Flyboy Airmaster GMT Automatic at true scale

Flyboy Airmaster GMT Automatic

Seiko 5 Sports Field series at true scale

5 Sports Field series

Diameter

40mm

39.4mm

Lug-to-Lug

n/a

48.1mm

Thickness

n/a

13.2mm

Water Resistance

50m

100m

highest

Power Reserve

n/a

41h

MSRP

$345

$315

lowest

Movement

Seiko NH34

Seiko 4R36

Case

7 specs
Category
GMT
Sport
Diameter
40mm
39.4mm
Thickness
n/a
13.2mm
Lug-to-Lug
n/a
48.1mm
Lug Width
n/a
20mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
50m
100m

Crystal & Dial

3 specs
Crystal
Sapphire
Hardlex
Crystal Shape
n/a
Curved
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Seiko NH34
Seiko 4R36
Power Reserve
0h
41h
Jewels
0
24

Pricing

1 specs
MSRP
$345
$315
Keep your wishlist and collection together in the appExplore the app

Reviews

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 unique aviator style, robust build, and crisp dial texture, with one owner noting a complex three-timezone function. The watch is considered fun and wearable with solid dimensions, though some find the dial busy and difficult to read, and the stock strap is noted as cheap with limited lug hole options. Some owners question the quality relative to price, while others acknowledge that AVI-8 watches, often featuring Seiko NH34 movements, are generally considered decent for their $100-$200 price point. On balance, owners rate the AVI-8 Flyboy Airmaster GMT Automatic well for its standout aviator design and value at the price.

Seiko 5 Sports Field series

The Seiko 5 Sports Field series is praised for its excellent legibility, featuring fully lumed Arabic numerals and a lumed pearl on the compass bezel. Reviewers note the reliable 4R36 movement and 10 bar water resistance, with some considering the watches good value under 500 euros. The GMT variants, specifically the SSK023 and SSK025, offer an accessible explorer watch with a GMT complication and a fixed 24-hour bezel. Overall, owners and reviewers rate the Seiko 5 Sports Field series highly for its legibility and value proposition.