Jack Mason Strat-o-timer GMTvsSeiko Prospex Sea

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Jack Mason Strat-o-timer GMT

MSRP $1,099

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Buy from Jack Mason Used on eBay

Seiko Prospex Sea

MSRP $900

See the full watch

Buy from Seiko Used on eBay

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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.

Strat-o-timer GMT

Prospex Sea

Diameter

Across the case, crown excluded.

40mm

41mm

Lug-to-Lug

The number that decides fit.

47mm

46.9mm

lowest

Thickness

How it sits under a cuff.

13.2mm

12.3mm

lowest

Water Resistance

Rated in meters.

200m

Power Reserve

How long it runs off the wrist.

42h

70h

highest

MSRP

Sticker price, new.

$1,099

$900

lowest

Movement

What drives the hands.

Miyota 9075

Seiko 6R35

Spec

Strat-o-timer GMT

Prospex Sea

Case

4 specs

Crystal & Dial

4 specs

Crystal Shape

n/a

Curved

AR Coating

n/a

Anti-reflective coating on inner surface

Dial Color

n/a

Lume

None

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

Miyota 9075

Seiko 6R35

Power Reserve

42h

70h

Jewels

Pricing

1 specs

MSRP

$1,099

$900

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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

Owners and reviewers widely praise the Jack Mason Strat-o-timer GMT for its excellent value and impressive fit and finish, particularly noting the quality of the 7-link bracelet and the scratch-resistant sapphire bezel insert. The watch is recognized for offering a true traveler's GMT complication with the Miyota 9075 movement at a competitive price point, with many appreciating its comfortable 40mm tonneau case and vintage styling. Some owners find the hour markers to be a bit chunky, and one user noted slightly scratchy crown operation. Overall, owners rate the Jack Mason Strat-o-timer GMT highly for its exceptional value and build quality at its price point.

From video reviewers

The Miyota 9075 true GMT movement is a consistent strength. Reviewers noted the exceptional lightness and comfort due to Grade 2 titanium construction. Opinions on whether further refinements are needed were not shared.

Owners widely praise the Seiko Prospex Sea for its value and robust build, with many highlighting its excellent lume and attractive design. Some owners find the 41mm case size perfect, while others with smaller wrists consider it too large, thick, and heavy. The stock rubber strap is noted as uncomfortable for land wear by one owner. Overall, owners rate the Seiko Prospex Sea highly for its design and value at the price point.