Side by side

Casio GM-B2100SDvsTimefactors Speedbird GMT

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

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GM-B2100SD
CasioGM-B2100SD
MSRP $600
See the full GM-B2100SD
Speedbird GMT
TimefactorsSpeedbird GMT
MSRP $315
See the full Speedbird GMT
Buy from Casio ↗
Buy used on eBay ↗
Buy from Timefactors ↗
Buy used on eBay ↗

At a glance

12 of 29 specs differ
Diameter
GM-B2100SD44.4mm
Speedbird GMT36mm
Power Reserve
GM-B2100SD—
Speedbird GMT—
Water Resistance
GM-B2100SD200m
Speedbird GMT100m
MSRP
GM-B2100SD$600
Speedbird GMT$315

Full specifications

Case

7 specs
Category
Sport
—
Diameter
44.4mm
36mm
Thickness
12.8mm
11.6mm
Lug-to-Lug
49.8mm
42.5mm
Lug Width
—
18mm
Finish
—
—
Water Resistance
200m
100m

Crystal & Dial

3 specs
Crystal
Mineral
Sapphire
AR Coating
No
—
Lume
None
Super Luminova X1 C3

Movement

1 specs
Caliber
—
Ronda 515

Pricing

1 specs
MSRP
$600
$315
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