Side by side

Casio GBM-2100AvsOblvlo JM Rotor

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.

Oblvlo JM Rotor

Owners widely praise the Oblvlo Star Wheel for its artistic dial, crisp finishing, and sturdy build, noting it wears well on smaller wrists due to its actual dimensions being smaller than listed. The winding action is described as smooth, though the lume is consistently flagged as weak and imprecise in darkness, and the lack of anti-glare coating is a drawback for some. On balance, owners rate the Oblvlo highly for its artistic dial and build quality at the price.

At a glance

15 of 29 specs differ
Diameter
GBM-2100A44.4mm
JM Rotor42mm
Power Reserve
GBM-2100A
JM Rotor42h
Water Resistance
GBM-2100A200m
JM Rotor50m
MSRP
GBM-2100A$280
JM Rotor$299

Full specifications

Case

7 specs
Diameter
44.4mm
42mm
Thickness
11.9mm
13mm
Lug-to-Lug
49.3mm
0mm
Lug Width
0mm
Material
Bio-based Resin / Stainless steel
Stainless Steel
Finish
Water Resistance
200m
50m

Crystal & Dial

3 specs
Crystal
Mineral
Sapphire
AR Coating
No
Dial Color
Silver

Movement

4 specs
Caliber
Miyota 8215
Type
Quartz
Automatic
Power Reserve
42h
Jewels
0
21

Pricing

1 specs
MSRP
$280
$299
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