Side by side

Christopher Ward C63 Sealander Extreme GMTvsSeiko Astron GPS Solar 2025 Limited Edition

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 $1,850
Astron GPS Solar 2025 Limited Edition
SeikoAstron GPS Solar 2025 Limited Edition
MSRP $2,600

At a glance

16 of 29 specs differ
Diameter
C63 Sealander Extreme GMT48mm
Astron GPS Solar 2025 Limited Edition42mm
Power Reserve
C63 Sealander Extreme GMT56h
Astron GPS Solar 2025 Limited Edition40h
Water Resistance
C63 Sealander Extreme GMT150m
Astron GPS Solar 2025 Limited Edition100m
MSRP
C63 Sealander Extreme GMT$1,850
Astron GPS Solar 2025 Limited Edition$2,600

Full specifications

Case

7 specs
Diameter
48mm
42mm
Thickness
12.05mm
12mm
Lug-to-Lug
48mm
47.9mm
Lug Width
22mm
14mm
Material
Stainless Steel
Titanium
Finish
Brushed + Bead-blasted + Sandblasted
Brushed and polished
Water Resistance
150m
100m

Crystal & Dial

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

Movement

6 specs
Caliber
SW330
3X62
Type
Automatic
Quartz
Beat Rate
4 vph
28,800 vph
Power Reserve
56h
40h
Jewels
25
10
Complications
GMT, Moonphase, Day-date
None

Pricing

1 specs
MSRP
$1,850
$2,600

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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

Owners and reviewers widely praise the Christopher Ward C63 Sealander Extreme GMT for its excellent value, tactical and travel-ready design, and impressive lume, with the black dial being a collective favorite. Its 41mm brushed steel case is noted for comfort and wearability, complemented by a well-proportioned design and excellent legibility. The watch features a Sellita SW330-2 movement with a 56-hour power reserve and 150m water resistance, including a shock-absorbing mount. Some find its refinement slightly less than pricier alternatives, and its GMT movement is considered less practical than a flyer GMT. On balance, the Christopher Ward C63 Sealander Extreme GMT is highly regarded by owners and reviewers for its compelling blend of features, rugged design, and exceptional value.

Seiko Astron GPS Solar 2025 Limited Edition

The Seiko Astron GPS Solar 2025 Limited Edition is widely praised for its advanced GPS time and date adjustment capabilities, powered by light to eliminate battery changes. Owners and reviewers highlight its impressive accuracy and the convenience of automatic time zone updates, with some specifically commending the wearability of the 39mm size and its clean, simple design. However, reception of the GPS signal requires an unobstructed view of the sky, and manual time zone adjustments are necessary for Daylight Saving Time on some variants. One owner notes a slight imperfection in chapter ring alignment on the 39mm model. On balance, owners and reviewers rate the Seiko Astron GPS Solar 2025 Limited Edition highly for its satellite-powered timekeeping and improved wearability in the 39mm configuration.

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