Side by side
Borealis Watch Co. Porto CovovsNorthern Star Watch Sentinel
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
10 of 29 specs differDiameter
Porto Covo40mm
Sentinel40.5mm
Power Reserve
Porto Covo40h
Sentinel42h
Water Resistance
Porto Covo300m
Sentinel50m
MSRP
Porto Covo$415
Sentinel$649
Full specifications
Case
5 specsCategory
Diver
—
Diameter
40mm
40.5mm
Thickness
11.6mm
10.1mm
Lug-to-Lug
42.5mm
43.72mm
Water Resistance
300m
50m
Crystal & Dial
2 specsDial Color
Black
White
Lume
BGW9
None
Movement
2 specsCaliber
Miyota 9039
Miyota 90S5
Power Reserve
40h
42h
Pricing
1 specsMSRP
$415
$649
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