Side by side

Casio GBM-2100AvsUnimatic Modello Uno UT1-BSTN Collab Diver

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-BSTN Collab Diver

The Unimatic Modello Uno UT1-BSTN Collab Diver is widely praised for its robust, tool-watch design and utilitarian features, including MIL-STD-810H shock resistance and individually pressure-tested cases. Reviewers highlight the sandblasted 41.5mm steel case with its masculine, monolithic feel and bold lugs, as well as the legible dial. The Seiko VH31 mecaquartz movement provides quartz accuracy with a sweeping seconds hand, and the watch boasts 300m water resistance. One reviewer notes a lack of contrast between the luminous indexes and the dial, and another points out the crystal's lack of AR-coating as a hint at its price point. Overall, reviewers rate the Unimatic Modello Uno UT1-BSTN Collab Diver highly for its rugged build and practical, entry-level tool watch appeal.

At a glance

14 of 29 specs differ
Diameter
GBM-2100A44.4mm
Modello Uno UT1-BSTN Collab Diver41.5mm
Power Reserve
GBM-2100A
Modello Uno UT1-BSTN Collab Diver
Water Resistance
GBM-2100A200m
Modello Uno UT1-BSTN Collab Diver300m
MSRP
GBM-2100A$280
Modello Uno UT1-BSTN Collab Diver$680

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
$680
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