Side by side
Borealis Watch Co. Sea Storm MK2 GMTvsGrand Seiko SLGB023
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
SLGB02340.8mm
Power Reserve
Sea Storm MK2 GMT40h
SLGB02372h
Water Resistance
Sea Storm MK2 GMT300m
SLGB023300m
MSRP
Sea Storm MK2 GMT$415
SLGB023$12,400
Full specifications
Case
5 specsDiameter
41.50mm
40.8mm
Thickness
14.15mm
12.9mm
Lug-to-Lug
48.50mm
48.5mm
Lug Width
20mm
21mm
Material
Stainless Steel
Titanium
Crystal & Dial
2 specsAR Coating
Inner
Yes
Lume
BGW9
None
Movement
3 specsCaliber
NH34
9RB1
Type
Automatic
Spring Drive
Power Reserve
40h
72h
Pricing
1 specsMSRP
$415
$12,400
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