Side by side

CWC G40 Sonar Quartz WatchvsSeiko Prospex Sea The Black Series

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

G40 Sonar Quartz Watch
CWCG40 Sonar Quartz Watch
MSRP $333
Prospex Sea The Black Series
SeikoProspex Sea The Black Series
MSRP $765
What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

CWC G40 Sonar Quartz Watch

Owners widely appreciate the CWC G40 Sonar Quartz Watch for its classic G10 design, 40mm case size, and 20atm water resistance, noting its light, rugged, and reliable "grab-n-go" nature. Some find the dial proportions have too much negative space, while others praise its unique anodized red crown and quality NATO straps. A larger crown can dig into the wrist, and the lack of a battery hatch is a trade-off for its 100m water resistance. On balance, owners value the CWC G40 Sonar Quartz Watch for its robust build and classic aesthetic, though its price point and competition are frequently cited concerns.

Seiko Prospex Sea The Black Series

The Seiko Prospex Sea The Black Series is widely praised for its impressive value and compelling design elements. Reviewers highlight the SLA073's cave-diving-inspired dial, high-quality bracelet, and the robust 8L35 movement, calling it a standout release. The SRPE33 and SRPE39 models are noted for their attractive price, manta ray decorated dials, and excellent LumiBrite lume, though bezel alignment can be inconsistent. The SNJ029 is celebrated for its dynamic, colorful aesthetic, solar charging, and comfortable strap, making it ideal for outdoor adventures. Overall, the consensus is that Seiko Prospex Sea The Black Series models offer excellent value, with specific models lauded for their unique dials, quality finishing, and practical features like solar charging.

At a glance

12 of 29 specs differ
Diameter
G40 Sonar Quartz Watch40mm
Prospex Sea The Black Series45mm
Power Reserve
G40 Sonar Quartz Watch40h
Prospex Sea The Black Series41h
Water Resistance
G40 Sonar Quartz Watch200m
Prospex Sea The Black Series200m
MSRP
G40 Sonar Quartz Watch$333
Prospex Sea The Black Series$765

Full specifications

Case

5 specs
Category
Field
Diver
Diameter
40mm
45mm
Thickness
12mm
13.2mm
Lug-to-Lug
46mm
47.7mm
Lug Width
20mm
22mm

Crystal & Dial

3 specs
AR Coating
Yes
Anti-reflective coating on inner surface
Dial Color
CWC G40 Sonar Quartz Watch
Black
Lume
Super-LumiNova
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
4R36
Power Reserve
40h
41h
Jewels
25
24

Pricing

1 specs
MSRP
$333
$765
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