Side by side

Borealis Watch Co. Porto CovovsChristopher Ward C63 Sealander Extreme GMT

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

Porto Covo
Borealis Watch Co.Porto Covo
MSRP $415
C63 Sealander Extreme GMT
Christopher WardC63 Sealander Extreme GMT
MSRP $1,850

At a glance

14 of 29 specs differ
Diameter
Porto Covo40mm
C63 Sealander Extreme GMT48mm
Power Reserve
Porto Covo40h
C63 Sealander Extreme GMT56h
Water Resistance
Porto Covo300m
C63 Sealander Extreme GMT150m
MSRP
Porto Covo$415
C63 Sealander Extreme GMT$1,850

Full specifications

Case

7 specs
Category
Diver
GMT
Diameter
40mm
48mm
Thickness
11.6mm
12.05mm
Lug-to-Lug
42.5mm
48mm
Lug Width
20mm
22mm
Finish
Brushed and polished
Brushed + Bead-blasted + Sandblasted
Water Resistance
300m
150m

Crystal & Dial

2 specs
AR Coating
Inner
Underside
Lume
BGW9
SLN X1 BL / GL

Movement

4 specs
Caliber
Miyota 9039
SW330
Beat Rate
28,800 vph
4 vph
Power Reserve
40h
56h
Complications
None
GMT, Moonphase, Day-date

Pricing

1 specs
MSRP
$415
$1,850

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Borealis Watch Co. Porto Covo

The Borealis Porto Covo is widely praised for its 39mm size and unique cantilevered indices that create a 3D effect and depth. Owners note the indices' floating appearance is a well-executed design. One owner reported poor accuracy and a terse customer service response, while another wished for a 42mm size option. The $395 price is considered reasonable for a microbrand, though some feel it does not compare favorably to AliExpress options. Overall, owners appreciate the Borealis Porto Covo for its distinctive dial design and wearable 39mm case size.

Christopher Ward C63 Sealander Extreme GMT

Owners and reviewers widely praise the Christopher Ward C63 Sealander Extreme GMT for its excellent value, tactical and travel-ready design, and impressive lume, with the black dial being a collective favorite. Its 41mm brushed steel case is noted for comfort and wearability, complemented by a well-proportioned design and excellent legibility. The watch features a Sellita SW330-2 movement with a 56-hour power reserve and 150m water resistance, including a shock-absorbing mount. Some find its refinement slightly less than pricier alternatives, and its GMT movement is considered less practical than a flyer GMT. On balance, the Christopher Ward C63 Sealander Extreme GMT is highly regarded by owners and reviewers for its compelling blend of features, rugged design, and exceptional value.

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