Side by side

Christopher Ward C63 Sealander Extreme GMTvsSeiko Astron

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

C63 Sealander Extreme GMT
Christopher WardC63 Sealander Extreme GMT
MSRP $2,075
Astron
SeikoAstron
MSRP $2,500

At a glance

15 of 29 specs differ
Diameter
C63 Sealander Extreme GMT40mm
Astron42mm
Power Reserve
C63 Sealander Extreme GMT56h
Astron40h
Water Resistance
C63 Sealander Extreme GMT150m
Astron100m
MSRP
C63 Sealander Extreme GMT$2,075
Astron$2,500

Full specifications

Case

6 specs
Diameter
40mm
42mm
Thickness
12.05mm
12.4mm
Lug-to-Lug
48mm
49.5mm
Lug Width
22mm
14mm
Material
Stainless Steel
Titanium
Water Resistance
150m
100m

Crystal & Dial

2 specs
AR Coating
Inner
Super-clear coating
Lume
SLN X1 BL / GL
LumiBrite on hands and index(es)

Movement

6 specs
Caliber
SW330-2
5X83
Type
Automatic
Quartz
Beat Rate
4 vph
28,800 vph
Power Reserve
56h
40h
Jewels
25
14
Complications
GMT
None

Pricing

1 specs
MSRP
$2,075
$2,500

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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.

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. Reviewers consistently highlight its impressive Globolight lume, providing excellent legibility, and its well-proportioned 41mm brushed steel case. The Sellita SW330-2 movement is noted as reliable, though its standard accuracy is stated as ±20 seconds per day, and its GMT functionality is considered less advanced than some alternatives. One owner notes the green dial can be an acquired taste, and hands and markers are considered less refined than those on significantly more expensive watches. The Christopher Ward C63 Sealander Extreme GMT is priced attractively at €1,895 on bracelet. Overall, owners and reviewers highly regard the Christopher Ward C63 Sealander Extreme GMT for its rugged, travel-ready design and impressive lume at its price point.

Seiko Astron

Owners widely praise the Seiko Astron for its spectacular technology, solar-powered quartz movement, and GPS time synchronization, making it a convenient grab-and-go option. The watch is frequently noted for its comfortable and lightweight titanium build, with some models featuring well-finished cases and robust ceramic bezels. Reviewers and owners alike highlight the dial's dynamic and shiny appearance, with textured hour markers and high-contrast edges. Accuracy is generally considered good, with figures ranging from +/- 15 seconds per month to within 1/2 second per day, easily corrected by GPS signal. However, some owners note that DST requires manual adjustment and that automatic time syncing depends on proximity to radio wave towers. The price point is a concern for some, who feel it competes with luxury watches without the same aesthetic appeal. One owner pointed out minimal lume and a slight misalignment of the minute hand on their model.

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