Side by side

Casio GBM-2100AvsUnimatic Modello Uno UT1 Toolwatch Diver (41.5mm)

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

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.

Unimatic Modello Uno UT1 Toolwatch Diver (41.5mm)

Owners and reviewers praise the Unimatic Modello Uno UT1 Toolwatch Diver (41.5mm) for its personality-driven tool-watch dial, featuring Arabic numerals and minimal lume, and its grippy bezel and crown that are a joy to interact with. The sandblasted steel case is noted for its durability and refinement, with one source stating the 41.5mm case wears larger due to 22mm straps. The Seiko VH31 mechaquartz movement provides a sweeping second hand and accuracy of ±10–15 seconds per month, offering up to three years of battery life. The ice-blue dial's minimal contrast with luminous indexes is an aesthetic choice rather than a practical issue. On balance, owners and reviewers highly regard the Unimatic Modello Uno UT1 Toolwatch Diver (41.5mm) for its excellent value and worry-free summer diver functionality.

At a glance

14 of 29 specs differ
Diameter
GBM-2100A44.4mm
Modello Uno UT1 Toolwatch Diver (41.5mm)41.5mm
Power Reserve
GBM-2100A
Modello Uno UT1 Toolwatch Diver (41.5mm)
Water Resistance
GBM-2100A200m
Modello Uno UT1 Toolwatch Diver (41.5mm)300m
MSRP
GBM-2100A$280
Modello Uno UT1 Toolwatch Diver (41.5mm)$620

Full specifications

Case

8 specs
Category
Sport
Diameter
44.4mm
41.5mm
Thickness
11.9mm
0mm
Lug-to-Lug
49.3mm
0mm
Lug Width
0mm
Material
Bio-based Resin / Stainless steel
Finish
Water Resistance
200m
300m

Crystal & Dial

3 specs
Crystal
Mineral
AR Coating
No
Dial Color
Silver
Black

Movement

2 specs
Caliber
Seiko VH31
Power Reserve
0h

Pricing

1 specs
MSRP
$280
$620
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