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Castor Watches KOI DARKvsSeiko Prospex Rotocall

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
Prospex Rotocall
SeikoProspex Rotocall
MSRP $550
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Buy used on eBay ↗
Buy from Seiko ↗
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At a glance

12 of 29 specs differ
Diameter
KOI DARK38mm
Prospex Rotocall37mm
Power Reserve
KOI DARK—
Prospex Rotocall40h
Water Resistance
KOI DARK50m
Prospex Rotocall100m
MSRP
KOI DARK—
Prospex Rotocall$550

Full specifications

Case

7 specs
Category
—
Sport
Diameter
38mm
37mm
Thickness
7mm
10.6mm
Lug-to-Lug
—
43.5mm
Lug Width
18mm
20mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
50m
100m

Crystal & Dial

2 specs
Crystal
Mineral
Hardlex
Dial Color
Copper
Black

Movement

2 specs
Caliber
Miyota 2035
A824
Power Reserve
—
40h

Pricing

1 specs
MSRP
—
$550
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