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 $2,000

At a glance

15 of 29 specs differ
Diameter
C63 Sealander Extreme GMT40mm
King Seiko KSK38.3mm
Power Reserve
C63 Sealander Extreme GMT56h
King Seiko KSK72h
Water Resistance
C63 Sealander Extreme GMT150m
King Seiko KSK100m
MSRP
C63 Sealander Extreme GMT$2,075
King Seiko KSK$2,000

Full specifications

Case

6 specs
Category
GMT
Dress
Diameter
40mm
38.3mm
Thickness
12.05mm
11.7mm
Lug-to-Lug
48mm
46mm
Lug Width
22mm
19mm
Water Resistance
150m
100m

Crystal & Dial

3 specs
Crystal Shape
Flat
Box
AR Coating
Inner
Anti-reflective coating on inner surface
Lume
SLN X1 BL / GL
LumiBrite on Hands

Movement

5 specs
Caliber
SW330-2
6R55
Beat Rate
4 vph
28,800 vph
Power Reserve
56h
72h
Jewels
25
24
Complications
GMT
None

Pricing

1 specs
MSRP
$2,075
$2,000

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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's sharp, faceted case design and harmonious mid-century aesthetic. Its compact 38.1mm or 37mm size and slim 10.7mm thickness are noted as highly wearable. However, accuracy is a point of contention, with one reviewer reporting a wide range of +25 to -15 seconds per day for the 6R31 movement, while others criticize the standard 6R movement as too thick and a departure from the brand's history. Water resistance is consistently cited as limited to 50 meters, and one owner reported misaligned screws on the caseback and clasp. On balance, owners and reviewers find the King Seiko KSK appealing for its design and wearability, though the movement choice and accuracy are significant drawbacks for some.

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