Side by side

Casio GM-B2100SDvsRockwell Time 50mm

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

Add a watch
GM-B2100SD
CasioGM-B2100SD
MSRP $600
See the full GM-B2100SD
50mm
Rockwell Time50mm
MSRP $800
See the full 50mm
Buy from Casio ↗
Buy used on eBay ↗
Buy from Rockwell Time ↗
Buy used on eBay ↗

At a glance

13 of 29 specs differ
Diameter
GM-B2100SD44.4mm
50mm50mm
Power Reserve
GM-B2100SD—
50mm—
Water Resistance
GM-B2100SD200m
50mm100m
MSRP
GM-B2100SD$600
50mm$800

Full specifications

Case

7 specs
Category
Sport
—
Diameter
44.4mm
50mm
Thickness
12.8mm
0mm
Lug-to-Lug
49.8mm
0mm
Lug Width
—
0mm
Finish
—
—
Water Resistance
200m
100m

Crystal & Dial

3 specs
Crystal
Mineral
Sapphire
AR Coating
No
—
Dial Color
Black
—

Movement

2 specs
Caliber
—
Ronda 1069
Power Reserve
—
0h

Pricing

1 specs
MSRP
$600
$800
Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Citizen Promaster Skyhawk A-T
Citizen

Promaster Skyhawk A-T

9 watches · 24 variantsPromaster
45mm·Quartz·200m WR
$596MSRP
—Used
Rockwell Time 50mm Murdered Dial
Rockwell Timemicro
50mm Murdered Dial Edition

50mm Murdered Dial

3 variantsSeries
50mm·Quartz
$2,500MSRP
—Used
Citizen Promaster Professional Diver
Citizen
Promaster DiverPromaster

Promaster Professional Diver

9 watches · 22 variantsPromaster
45mm·Solar·200m WR
$356MSRP
—Used
Von Doren Runde
Von Dorenmicro

Runde

14 variantsSeries
39mm·Quartz
$369MSRP
—Used
Tissot Seastar 1000 Chronograph
Tissot

Seastar 1000 Chronograph

45.5mm·Quartz·300m WR
$650MSRP
—Used
Von Doren X Engwind - The Conservation
Von Dorenmicro
von doren x engwind

X Engwind - The Conservation

39mm·Quartz
$450MSRP
—Used
Tissot PRC 200
Tissot
PR 100

PRC 200

2 variantsPRC 200
43mm·Quartz·200m WR
$595MSRP
—Used
Smith & Bradley Atlantis A2 Quartz
Smith & Bradley

Atlantis A2 Quartz

4 variantsAtlantis A2 Quartz
44mm·Quartz·300m WR
$349MSRP
—Used
All alternatives to the GM-B2100SD →All alternatives to the 50mm →
Explore the full catalog

Follow this matchup

Get a note when Casio GM-B2100SD vs Rockwell Time 50mm gets more votes, a community discussion, or a price drop. No account needed.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.

Elliot Brown CANFORD: 202-004vsRockwell Time 50mmJorg Gray Watches JG8400vsRockwell Time 50mmJorg Gray Watches JG9700vsRockwell Time 50mmBERNY BERNY-Men Quartz Fashion Watch-2285VMvsRockwell Time 50mmBERNY BERNY-Men Automatic Compressor-style Diver Watch-AM7081MSvsCasio GM-B2100SDBERNY Men Automatic Dress Watch-AM020MvsCasio GM-B2100SD
Edit this comparisonAdd another watchExplore more 43–51mm watches