Which is cheaper, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

At MSRP the Borealis Watch Co. Sea Storm MK2 GMT is the cheaper of the two at $415, against $2,500 for the Seiko Prospex SPEEDTIMER Mechanical Chronograph — a $2,085 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

The Seiko Prospex SPEEDTIMER Mechanical Chronograph wears larger at 42mm versus 41.50mm for the Borealis Watch Co. Sea Storm MK2 GMT — a 0.5mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

The Borealis Watch Co. Sea Storm MK2 GMT is rated to 300m versus 10m for the Seiko Prospex SPEEDTIMER Mechanical Chronograph.

Which has a longer power reserve, the Borealis Watch Co. Sea Storm MK2 GMT or the Seiko Prospex SPEEDTIMER Mechanical Chronograph?

The Seiko Prospex SPEEDTIMER Mechanical Chronograph carries a 45-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 SPEEDTIMER Mechanical Chronograph?

Both watches run automatic movements — the Borealis Watch Co. Sea Storm MK2 GMT uses the NH34 and the Seiko Prospex SPEEDTIMER Mechanical Chronograph uses the 8R48.

Side by side

Borealis Watch Co. Sea Storm MK2 GMTvsSeiko Prospex SPEEDTIMER Mechanical Chronograph

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

Borealis Watch Co.Sea Storm MK2 GMT

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MSRP $415

Seiko Prospex SPEEDTIMER Mechanical Chronograph

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MSRP $2,500

At a glance

13 of 29 specs differ

Diameter

Sea Storm MK2 GMT41.50mm

Prospex SPEEDTIMER Mechanical Chronograph42mm

Power Reserve

Sea Storm MK2 GMT40h

Prospex SPEEDTIMER Mechanical Chronograph45h

Water Resistance

Sea Storm MK2 GMT300m

Prospex SPEEDTIMER Mechanical Chronograph100m

MSRP

Sea Storm MK2 GMT$415

Prospex SPEEDTIMER Mechanical Chronograph$2,500

Full specifications

Case

6 specs

Crystal & Dial

3 specs

Crystal Shape

Flat

Curved

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

BGW9

LumiBrite on hands and index(es)

Movement

3 specs

Caliber

NH34

8R48

Power Reserve

40h

45h

Jewels

Pricing

1 specs

MSRP

$415

$2,500

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