Christopher Ward C63 Sealander Extreme GMTvsJack Mason Strat-o-timer 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.

Christopher Ward C63 Sealander Extreme GMT at true scale

C63 Sealander Extreme GMT

Jack Mason Strat-o-timer GMT at true scale

Strat-o-timer GMT

Diameter

41mm

40mm

Lug-to-Lug

48mm

47mm

lowest

Thickness

12.1mm

lowest

13.2mm

Water Resistance

150m

200m

highest

Power Reserve

56h

highest

42h

MSRP

$2,075

$1,099

lowest

Movement

Sellita SW330-2

Miyota 9075

Case

5 specs
Diameter
41mm
40mm
Thickness
12.05mm
13.2mm
Lug-to-Lug
48mm
47mm
Lug Width
22mm
20mm
Water Resistance
150m
200m

Crystal & Dial

2 specs
Dial Color
Black
n/a
Lume
SLN X1 BL / GL
None

Movement

5 specs
Caliber
Sellita SW330-2
Miyota 9075
Beat Rate
4 vph
0 vph
Power Reserve
56h
42h
Jewels
25
0
Complications
GMT
None

Pricing

1 specs
MSRP
$2,075
$1,099
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Reviews

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

Christopher Ward C63 Sealander Extreme GMT

The Christopher Ward C63 Sealander Extreme GMT is widely praised as a competent and comfortable tool watch offering excellent value, with reviewers highlighting its impressive lume and tactical, travel-ready design. Owners and reviewers note its 41mm brushed steel case, Globolight lume, and Sellita SW330-2 movement, which is generally considered reliable despite a standard accuracy rating of ±20 seconds per day. Some find the green dial an acquired taste and consider its hands and markers less refined than those on significantly more expensive watches. On balance, owners and reviewers rate the Christopher Ward C63 Sealander Extreme GMT highly for its impressive lume and value proposition.

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.

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