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Casio GBM-2100AvsCWC G40 Sonar Quartz Watch

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

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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.

Casio GBM-2100A

The premium stainless steel bezel and Bluetooth connectivity are highlighted strengths. The increased mass from the metal bezel is noted as a potential drawback for some wearers. Reviewers differ on its value proposition compared to other G-Shock models.

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.

At a glance

14 of 29 specs differ
Diameter
GBM-2100A44.4mm
G40 Sonar Quartz Watch40mm
Power Reserve
GBM-2100A
G40 Sonar Quartz Watch
Water Resistance
GBM-2100A200m
G40 Sonar Quartz Watch200m
MSRP
GBM-2100A$280
G40 Sonar Quartz Watch$333

Full specifications

Case

7 specs
Category
Sport
Field
Diameter
44.4mm
40mm
Thickness
11.9mm
46mm
Lug-to-Lug
49.3mm
12mm
Lug Width
20mm
Material
Bio-based Resin / Stainless steel
Stainless Steel
Finish

Crystal & Dial

4 specs
Crystal
Mineral
Sapphire
AR Coating
No
Yes
Dial Color
Silver
CWC G40 Sonar Quartz Watch
Lume
None
Super-LumiNova

Movement

2 specs
Caliber
Power Reserve
0h

Pricing

1 specs
MSRP
$280
$333
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