Side by side

Casio GBM-2100AvsMomentum M20

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

GBM-2100A
CasioGBM-2100A
MSRP $280
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.

Momentum M20

Owners widely praise the Momentum M20's solid build quality, sapphire crystal, and satisfying bezel action, with one owner calling it a great "premium beater" for its price. The watch is noted for its heavy-duty yet comfortable bracelet and lume, with some appreciating the GMT numerals on the rehaut for bezel utility. However, one owner criticizes the second hand's alignment with markers. Overall, owners rate the Momentum M20 highly for its robust construction and tool watch functionality at an accessible price point.

At a glance

13 of 29 specs differ
Diameter
GBM-2100A44.4mm
M2042mm
Power Reserve
GBM-2100A
M20
Water Resistance
GBM-2100A200m
M20200m
MSRP
GBM-2100A$280
M20$285

Full specifications

Case

7 specs
Category
Sport
Diameter
44.4mm
42mm
Thickness
11.9mm
0mm
Lug-to-Lug
49.3mm
0mm
Lug Width
22mm
Material
Bio-based Resin / Stainless steel
Stainless Steel
Finish

Crystal & Dial

3 specs
Crystal
Mineral
Sapphire
AR Coating
No
Dial Color
Silver

Movement

2 specs
Caliber
Ronda 515
Power Reserve
0h

Pricing

1 specs
MSRP
$280
$285
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