Side by side

Castor Watches KOI DARKvsSunrex Beta

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

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KOI DARK
Castor WatchesKOI DARK
Beta
SunrexBeta
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Buy from Sunrex ↗
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At a glance

11 of 29 specs differ
Diameter
KOI DARK38mm
Beta41mm
Power Reserve
KOI DARK—
Beta40h
Water Resistance
KOI DARK50m
Beta100m
MSRP
KOI DARK—
Beta—

Full specifications

Case

6 specs
Diameter
38mm
41mm
Thickness
7mm
14mm
Lug-to-Lug
—
48mm
Lug Width
18mm
—
Material
316L Stainless Steel
Stainless Steel
Water Resistance
50m
100m

Crystal & Dial

2 specs
Crystal
Mineral
Sapphire
Dial Color
Copper
Black

Movement

3 specs
Caliber
Miyota 2035
Epson VS75A
Type
Quartz
Solar
Power Reserve
—
40h
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