Side by side
Borealis Watch Co. Sea Storm MK2vsGrand Seiko SBGM221
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 MK241.50mm
SBGM22139.5mm
Power Reserve
Sea Storm MK240h
SBGM22172h
Water Resistance
Sea Storm MK2300m
SBGM22130m
MSRP
Sea Storm MK2$475
SBGM221$5,400
Full specifications
Case
6 specsCategory
Diver
GMT
Diameter
41.50mm
39.5mm
Thickness
14.15mm
13.7mm
Lug-to-Lug
48.50mm
46.9mm
Lug Width
20mm
19mm
Water Resistance
300m
30m
Crystal & Dial
2 specsAR Coating
Inner
Yes
Lume
BGW9
None
Movement
2 specsCaliber
NH38
9S66
Power Reserve
40h
72h
Pricing
1 specsMSRP
$475
$5,400
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