Side by side

Christopher Ward C65 Aquitaine Bronze COSCvsSeiko Prospex Sea

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

C65 Aquitaine Bronze COSC
Christopher WardC65 Aquitaine Bronze COSC
MSRP $1,695
Prospex Sea
SeikoProspex Sea
MSRP $625

At a glance

15 of 29 specs differ
Diameter
C65 Aquitaine Bronze COSC46.68mm
Prospex Sea43.8mm
Power Reserve
C65 Aquitaine Bronze COSC38h
Prospex Sea41h
Water Resistance
C65 Aquitaine Bronze COSC200m
Prospex Sea200m
MSRP
C65 Aquitaine Bronze COSC$1,695
Prospex Sea$625

Full specifications

Case

6 specs
Diameter
46.68mm
43.8mm
Thickness
12.45mm
12.8mm
Lug-to-Lug
46.68mm
48.7mm
Material
Bronze
Stainless Steel
Finish
Brushed + Polished
Brushed and polished
Caseback
Display
Solid

Crystal & Dial

3 specs
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
Blue
Black
Lume
SLN X1 BL Old Radium
LumiBrite on hands, index(es) and bezel

Movement

5 specs
Caliber
SW200
4R35
Beat Rate
4 vph
28,800 vph
Power Reserve
38h
41h
Jewels
26
23
Complications
Moonphase, Day-date, Date
None

Pricing

1 specs
MSRP
$1,695
$625

Follow this matchup

Get a note when Christopher Ward C65 Aquitaine Bronze COSC vs Seiko Prospex Sea gets more votes, a community discussion, or a price drop. No account needed.

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 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.

Seiko Prospex Sea

The Seiko Prospex Sea is widely praised for its excellent value, solid build quality, and comfortable wearability, with many models featuring impressive lume and attractive dials. Owners and reviewers highlight the modern upgrades on classic designs, such as drilled lugs and reliable movements with hacking and hand-winding capabilities. Some models are noted for their refined case finishing and scratch resistance. Accuracy figures vary, with one owner reporting approximately 4 seconds fast per day, while others find the movements offer good performance for the price. Concerns raised by owners and reviewers include clasps that can feel generic or cheap, and lug widths that some find disproportionate to the case size on certain models. The thickness and weight of some Prospex Sea watches are also noted as substantial. The GMT function on specific models is considered secondary and difficult to read for true travel purposes.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.