Which is cheaper, the Borealis Watch Co. Sea Storm MK2 GMT or the Tudor Black Bay 58 Bronze?

At MSRP the Borealis Watch Co. Sea Storm MK2 GMT is the cheaper of the two at $415, against $5,850 for the Tudor Black Bay 58 Bronze — a $5,435 gap before any retailer discounting.

Which is bigger, the Borealis Watch Co. Sea Storm MK2 GMT or the Tudor Black Bay 58 Bronze?

The Borealis Watch Co. Sea Storm MK2 GMT wears larger at 41.50mm versus 39mm for the Tudor Black Bay 58 Bronze — a 2.5mm difference across the dial.

Which has better water resistance, the Borealis Watch Co. Sea Storm MK2 GMT or the Tudor Black Bay 58 Bronze?

The Borealis Watch Co. Sea Storm MK2 GMT is rated to 300m versus 200m for the Tudor Black Bay 58 Bronze.

Which has a longer power reserve, the Borealis Watch Co. Sea Storm MK2 GMT or the Tudor Black Bay 58 Bronze?

The Tudor Black Bay 58 Bronze carries a 70-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 Tudor Black Bay 58 Bronze?

Both watches run automatic movements — the Borealis Watch Co. Sea Storm MK2 GMT uses the NH34 and the Tudor Black Bay 58 Bronze uses the MT5400.

Side by side

Borealis Watch Co. Sea Storm MK2 GMTvsTudor Black Bay 58 Bronze

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

Tudor Black Bay 58 Bronze

m79012m-0001

MSRP $5,850

At a glance

18 of 29 specs differ

Diameter

Sea Storm MK2 GMT41.50mm

Black Bay 58 Bronze39mm

Power Reserve

Sea Storm MK2 GMT40h

Black Bay 58 Bronze70h

Water Resistance

Sea Storm MK2 GMT300m

Black Bay 58 Bronze200m

MSRP

Sea Storm MK2 GMT$415

Black Bay 58 Bronze$5,850

Full specifications

Case

8 specs

Diameter

41.50mm

39mm

Thickness

14.15mm

11.9mm

Lug-to-Lug

48.50mm

46mm

Lug Width

20mm

Material

Stainless Steel

Bronze

Finish

Brushed and polished

Brushed + Satin

Water Resistance

300m

200m

Caseback

Solid

Engraved

Crystal & Dial

3 specs

Crystal Shape

Flat

—

AR Coating

Inner

—

Lume

BGW9

None

Movement

6 specs

Caliber

NH34

MT5400

Beat Rate

28,800 vph

0 vph

Power Reserve

40h

70h

Jewels

Hacking

Yes

Hand-winding

Yes

Pricing

1 specs

MSRP

$415

$5,850

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