Side by side

Christopher Ward C63 Sealander Extreme GMTvsSeiko King Seiko KSK

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
King Seiko KSK
SeikoKing Seiko KSK
MSRP $3,300

At a glance

15 of 29 specs differ
Diameter
C63 Sealander Extreme GMT40mm
King Seiko KSK38.6mm
Power Reserve
C63 Sealander Extreme GMT56h
King Seiko KSK45h
Water Resistance
C63 Sealander Extreme GMT150m
King Seiko KSK50m
MSRP
C63 Sealander Extreme GMT$2,075
King Seiko KSK$3,300

Full specifications

Case

6 specs
Category
GMT
Dress
Diameter
40mm
38.6mm
Thickness
12.05mm
10.7mm
Lug-to-Lug
48mm
45.8mm
Lug Width
22mm
19mm
Water Resistance
150m
50m

Crystal & Dial

3 specs
Crystal Shape
Flat
Box
AR Coating
Inner
Anti-reflective coating on inner surface
Lume
SLN X1 BL / GL
None

Movement

5 specs
Caliber
SW330-2
6L35
Beat Rate
4 vph
28,800 vph
Power Reserve
56h
45h
Jewels
25
26
Complications
GMT
None

Pricing

1 specs
MSRP
$2,075
$3,300

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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 King Seiko KSK

Owners and reviewers widely praise the King Seiko KSK for its exceptional dial and case finishing, often compared to higher-end brands, and its slim, retro design. The use of the Calibre 6L35 movement in some variants is seen as a significant upgrade, contributing to a refined feel, while others note the bracelet is unusually nice and the case offers a mix of brushed and polished finishes with sharp angles. However, some owners question the value proposition, citing misaligned screws and clasp components on their examples, and the standard 6R movement in some models is criticized as a disappointment for the price point. Accuracy figures range from +15/-10 seconds per day to +5 to +7 seconds per day, and water resistance is rated at 5 BAR or 50 meters. Overall, owners and reviewers find the King Seiko KSK to be a beautiful and classy watch with fantastic finishing, though some are divided on its value and movement choice at its price point.

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