Side by side

Serica Ref. 5303 Diving ChronometervsChristopher Ward C63 Sealander Extreme GMT

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

Ref. 5303 Diving Chronometer
SericaRef. 5303 Diving Chronometer
MSRP $1,768
C63 Sealander Extreme GMT
Christopher WardC63 Sealander Extreme GMT
MSRP $1,850

At a glance

15 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
C63 Sealander Extreme GMT48mm
Power Reserve
Ref. 5303 Diving Chronometer42h
C63 Sealander Extreme GMT56h
Water Resistance
Ref. 5303 Diving Chronometer300m
C63 Sealander Extreme GMT150m
MSRP
Ref. 5303 Diving Chronometer$1,768
C63 Sealander Extreme GMT$1,850

Full specifications

Case

7 specs
Category
Diver
GMT
Diameter
39mm
48mm
Thickness
12.2mm
12.05mm
Lug-to-Lug
46.5mm
48mm
Lug Width
20mm
22mm
Finish
Brushed and polished
Brushed + Bead-blasted + Sandblasted
Water Resistance
300m
150m

Crystal & Dial

3 specs
AR Coating
Yes
Underside
Dial Color
Enamel Black
Black
Lume
Super-LumiNova
SLN X1 BL / GL

Movement

4 specs
Caliber
M100 COSC
SW330
Beat Rate
28,800 vph
4 vph
Power Reserve
42h
56h
Complications
COSC
GMT, Moonphase, Day-date

Pricing

1 specs
MSRP
$1,768
$1,850

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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.

Serica Ref. 5303 Diving Chronometer

Owners widely praise the Serica Ref. 5303 Diving Chronometer for its excellent wearability, definitive style, and smooth, confident bezel action. The dual scale on the bezel is noted as surprisingly useful, and the crown action, winding, and hacking are reported to work perfectly. One owner describes the Serica 5303-3 as gorgeous and unique, though another notes the crown can appear comically large. On balance, owners rate the Serica Ref. 5303 Diving Chronometer highly for its blend of unique design and robust functionality.

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.

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