Side by side

Borealis Watch Co. Sea Storm MK2vsGrand Seiko SBGE307

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

Sea Storm MK2
Borealis Watch Co.Sea Storm MK2
MSRP $475
SBGE307
Grand SeikoSBGE307
MSRP $11,500

At a glance

13 of 29 specs differ
Diameter
Sea Storm MK241.50mm
SBGE30744.5mm
Power Reserve
Sea Storm MK240h
SBGE30772h
Water Resistance
Sea Storm MK2300m
SBGE307200m
MSRP
Sea Storm MK2$475
SBGE307$11,500

Full specifications

Case

7 specs
Category
Diver
GMT
Diameter
41.50mm
44.5mm
Thickness
14.15mm
14.9mm
Lug-to-Lug
48.50mm
50mm
Lug Width
20mm
23mm
Material
Stainless Steel
Titanium
Water Resistance
300m
200m

Crystal & Dial

2 specs
AR Coating
Inner
Yes
Lume
BGW9
None

Movement

3 specs
Caliber
NH38
9R66
Type
Automatic
Spring Drive
Power Reserve
40h
72h

Pricing

1 specs
MSRP
$475
$11,500

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