Side by side
Borealis Watch Co. Sea Storm MK2 GMTvsSeiko Prospex Sea The Black Series
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
11 of 29 specs differDiameter
Sea Storm MK2 GMT41.50mm
Prospex Sea The Black Series45mm
Power Reserve
Sea Storm MK2 GMT40h
Prospex Sea The Black Series41h
Water Resistance
Sea Storm MK2 GMT300m
Prospex Sea The Black Series200m
MSRP
Sea Storm MK2 GMT$415
Prospex Sea The Black Series$765
Full specifications
Case
5 specsDiameter
41.50mm
45mm
Thickness
14.15mm
13.2mm
Lug-to-Lug
48.50mm
47.7mm
Lug Width
20mm
22mm
Water Resistance
300m
200m
Crystal & Dial
2 specsAR Coating
Inner
Anti-reflective coating on inner surface
Lume
BGW9
LumiBrite on hands, index(es) and bezel
Movement
3 specsCaliber
NH34
4R36
Power Reserve
40h
41h
Jewels
25
24
Pricing
1 specsMSRP
$415
$765
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