Side by side

CWC G40 Sonar Quartz WatchvsSeestern S456 GMT

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
S456 GMT
SeesternS456 GMT
MSRP $299
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.

Seestern S456 GMT

Owners widely praise the Seestern S456 GMT for its exceptional value and finishing that exceeds expectations, with one owner noting its accuracy surpasses that of their Seiko 5. The dial displays a pearl-like rainbow effect. Some owners would prefer a bidirectional bezel over the current unidirectional one. The Seestern S456 GMT features an NH34 movement, a 39.5mm case, sapphire crystal, and an adjustable clasp. On balance, owners rate the Seestern S456 GMT highly for its impressive finishing and value proposition at its price point.

From video reviewers

The watch features stunning, detailed finishing that is difficult to top. Reviewers did not reach a consensus on any weaknesses.

At a glance

15 of 29 specs differ
Diameter
G40 Sonar Quartz Watch40mm
S456 GMT41mm
Power Reserve
G40 Sonar Quartz Watch40h
S456 GMT41hh
Water Resistance
G40 Sonar Quartz Watch200m
S456 GMT200m
MSRP
G40 Sonar Quartz Watch$333
S456 GMT$299

Full specifications

Case

6 specs
Category
Field
GMT
Diameter
40mm
41mm
Thickness
12mm
13mm
Lug-to-Lug
46mm
49mm
Material
Stainless Steel
316L Stainless Steel
Finish
Brushed and polished
Brushed + Polished

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
CWC G40 Sonar Quartz Watch
Sunray style, applied and Diamond cut Indices, C1 lume
Lume
Super-LumiNova
C1

Movement

5 specs
Caliber
Seiko NH34
Beat Rate
28,800 vph
3 vph
Power Reserve
40h
41hh
Jewels
25
24
Complications
None
GMT

Pricing

1 specs
MSRP
$333
$299
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