Which is cheaper, the Borealis Watch Co. Sea Storm MK2 or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

At MSRP the Borealis Watch Co. Sea Storm MK2 is the cheaper of the two at $475, against $2,800 for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch — a $2,325 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Sea Storm MK2 or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

The Borealis Watch Co. Sea Storm MK2 wears larger at 41.50mm versus 39.5mm for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch — a 2mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Sea Storm MK2 or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

The Borealis Watch Co. Sea Storm MK2 is rated to 300m versus 200m for the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch.

Which has a longer power reserve, the Borealis Watch Co. Sea Storm MK2 or the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

The Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch carries a 45-hour power reserve against 40 hours on the Borealis Watch Co. Sea Storm MK2.

What movement does the Borealis Watch Co. Sea Storm MK2 run compared to the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch?

Both watches run automatic movements — the Borealis Watch Co. Sea Storm MK2 uses the NH38 and the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch uses the 6L37.

Side by side

Borealis Watch Co. Sea Storm MK2vsSeiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch

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

Borealis Watch Co.Sea Storm MK2

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MSRP $475

Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch

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MSRP $2,800

At a glance

12 of 29 specs differ

Diameter

Sea Storm MK241.50mm

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch39.5mm

Power Reserve

Sea Storm MK240h

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch45h

Water Resistance

Sea Storm MK2300m

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch200m

MSRP

Sea Storm MK2$475

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch$2,800

Full specifications

Case

5 specs

Diameter

41.50mm

39.5mm

Thickness

14.15mm

12.3mm

Lug-to-Lug

48.50mm

47.2mm

Lug Width

20mm

Water Resistance

300m

200m

Crystal & Dial

3 specs

Crystal Shape

Flat

Box

AR Coating

Inner

Anti-reflective coating on inner surface

Lume

BGW9

LumiBrite on hands, index(es) and bezel

Movement

3 specs

Caliber

NH38

6L37

Power Reserve

40h

45h

Jewels

Pricing

1 specs

MSRP

$475

$2,800

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