Side by side

Serica Ref. 5303 Diving ChronometervsChristopher Ward C65 Aquitaine Bronze COSC

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
C65 Aquitaine Bronze COSC
Christopher WardC65 Aquitaine Bronze COSC
MSRP $1,695

At a glance

17 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
C65 Aquitaine Bronze COSC46.68mm
Power Reserve
Ref. 5303 Diving Chronometer42h
C65 Aquitaine Bronze COSC38h
Water Resistance
Ref. 5303 Diving Chronometer300m
C65 Aquitaine Bronze COSC200m
MSRP
Ref. 5303 Diving Chronometer$1,768
C65 Aquitaine Bronze COSC$1,695

Full specifications

Case

8 specs
Diameter
39mm
46.68mm
Thickness
12.2mm
12.45mm
Lug-to-Lug
46.5mm
46.68mm
Lug Width
20mm
22mm
Material
Stainless Steel
Bronze
Finish
Brushed and polished
Brushed + Polished
Water Resistance
300m
200m
Caseback
Solid
Display

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Blue
Lume
Super-LumiNova
SLN X1 BL Old Radium

Movement

5 specs
Caliber
M100 COSC
SW200
Beat Rate
28,800 vph
4 vph
Power Reserve
42h
38h
Jewels
25
26
Complications
COSC
Moonphase, Day-date, Date

Pricing

1 specs
MSRP
$1,768
$1,695

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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 C65 Aquitaine Bronze COSC

Owners widely praise the Christopher Ward C65 Aquitaine Bronze COSC for its comfortable wearability, durable case and bezel, and smooth winding action, with one owner finding its case superior to a Tudor's. However, accuracy is a significant concern, with one owner reporting +17 seconds per day. The rubber strap is also noted as lacking refinement, and some suggest design tweaks for greater brand uniqueness. Overall, owners rate the Christopher Ward C65 Aquitaine Bronze COSC highly for its wearability and case finishing, despite accuracy concerns with the Sellita SW330-2 movement.

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