Borealis Watch Co. Porto CovovsFortis Marinemaster M-40
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Porto Covo

Marinemaster M-40
Diameter
40mm
40mm
Lug-to-Lug
42.5mm
n/a
Thickness
11.6mm
lowest
13mm
Water Resistance
300m
300m
Power Reserve
n/a
38h
MSRP
$350
lowest
$3,520
Movement
Miyota 9039
Sellita SW220-1
Case
3 specsCrystal & Dial
2 specsMovement
4 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Borealis Porto Covo for its unique floating indices, which create a striking 3D effect. Some owners find the 39mm case size appealing, while others wish for a larger 42mm option. The watch is priced around $395-$400, though some community members feel it does not offer good value compared to other options. One owner reported poor accuracy and a negative customer service experience. Overall, owners rate the Borealis Porto Covo highly for its distinctive dial design, despite some reservations on value and accuracy.
The dial's unique "floating" indices are consistently praised as a standout feature, offering significant visual depth. The Miyota 9 series movement is a shared positive specification. No shared weaknesses were identified.
Owners widely praise the Fortis Marinemaster M-40 for its gorgeous appearance and strong wrist presence, noting its impressive lume. The watch comes with a bracelet and three rubber straps, including a deployant buckle. On balance, owners rate the Fortis Marinemaster M-40 highly for its aesthetic appeal and comprehensive strap package.
The watch's Swiss Made construction and robust design are consistently praised. Reviewers noted the bracelet as a potential point of contention.
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