Which is cheaper, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

At MSRP the Borealis Watch Co. Sea Storm MK2 GMT is the cheaper of the two at $415, against $3,300 for the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition — a $2,885 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition wears larger at 44mm versus 41.50mm for the Borealis Watch Co. Sea Storm MK2 GMT — a 2.5mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Borealis Watch Co. Sea Storm MK2 GMT is rated to 300m versus 200m for the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition.

Which has a longer power reserve, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

The Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition carries a 50-hour power reserve against 40 hours on the Borealis Watch Co. Sea Storm MK2 GMT.

What movement does the Borealis Watch Co. Sea Storm MK2 GMT run compared to the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition?

Both watches run automatic movements — the Borealis Watch Co. Sea Storm MK2 GMT uses the NH34 and the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition uses the 8L35.

Side by side

Borealis Watch Co. Sea Storm MK2 GMTvsSeiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition

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

Borealis Watch Co.Sea Storm MK2 GMT

borealis-sea-storm-mk2-gmt-version-aa

MSRP $415

Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition

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MSRP $3,300

At a glance

12 of 29 specs differ

Diameter

Sea Storm MK2 GMT41.50mm

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition44mm

Power Reserve

Sea Storm MK2 GMT40h

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition50h

Water Resistance

Sea Storm MK2 GMT300m

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition200m

MSRP

Sea Storm MK2 GMT$415

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition$3,300

Full specifications

Case

5 specs

Diameter

41.50mm

44mm

Thickness

14.15mm

13mm

Lug-to-Lug

48.50mm

49.3mm

Lug Width

20mm

Water Resistance

300m

200m

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

BGW9

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

NH34

8L35

Power Reserve

40h

50h

Jewels

Pricing

1 specs

MSRP

$415

$3,300

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