Jack Mason Strat-o-timer GMT: Triton MeteoritevsSeiko Prospex Land Mechanical GMT

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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.

Jack Mason Strat-o-timer GMT: Triton Meteorite at true scale

Strat-o-timer GMT: Triton Meteorite

Seiko Prospex Land Mechanical GMT at true scale

Prospex Land Mechanical GMT

Diameter

40mm

39.5mm

Lug-to-Lug

47mm

46.4mm

lowest

Thickness

13.2mm

lowest

13.6mm

Water Resistance

200m

200m

Power Reserve

42h

72h

highest

MSRP

$1,449

$1,150

lowest

Movement

Miyota 9075

Seiko 6R54

Case

3 specs
Diameter
40mm
39.5mm
Thickness
13.2mm
13.6mm
Lug-to-Lug
47mm
46.4mm

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
n/a
n/a
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Miyota 9075
Seiko 6R54
Power Reserve
42h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$1,449
$1,150
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Reviews

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

Jack Mason Strat-o-timer GMT: Triton Meteorite

Owners and reviewers rate the Strat-o-timer GMT as strong value, with several praising its fit, finish, and bracelet, including the quick-adjust feature and the micro-adjust clasp. One owner calls it a true automatic GMT with sapphire crystals and a ceramic lumed bezel, and a reviewer highlights the sapphire bezel overlay and a working travel-GMT function that lets you quick-set local time in one-hour steps. Criticisms are narrower: a reviewer finds the strap ends large and the hour markers chunky, though legibility holds, and another source feels the price is a little high. Overall, owners and reviewers consider it a well-built, competent GMT whose real functionality and finishing justify its price.

Seiko Prospex Land Mechanical GMT

Owners widely praise the Seiko Prospex Land Mechanical GMT for its faithful reconstruction of the 6117 design, its attractive gray dial, and comfortable bracelet. Reviewers highlight its handsome everyday sports watch appeal and classic Seiko diver aesthetics. However, community members are split on the value proposition, with many deeming it overpriced at $970, suggesting a better price point around $700 or on sale. Some owners criticize the 6R54 movement's accuracy, reporting deviations of up to +/- 20 seconds per day, and prefer a local jumping GMT function over the caller style. On balance, owners and reviewers appreciate the Seiko Prospex Land Mechanical GMT's design and wearability, but opinions are divided on its price and movement performance relative to alternatives.

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