Fortis Marinemaster M-40vsRaven Custom - 39mm GMT Diver
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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.

Marinemaster M-40

Custom - 39mm GMT Diver
Diameter
40mm
39mm
Thickness
13mm
n/a
Water Resistance
300m
highest
200m
Power Reserve
38h
n/a
MSRP
$3,520
$590
lowest
Movement
Sellita SW220-1
Seiko NH34
Case
6 specsCrystal & Dial
1 specsMovement
4 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
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.
Owners praise the Raven Custom - 39mm GMT Diver for its 39mm case size, legibility, and bezel action. One owner notes the watch runs flawlessly. The Raven Custom - 39mm GMT Diver is offered new in box for $375, featuring a Seiko NH34 GMT movement and BGW9 lume. Some owners find the included bracelet too simple for the case finish and opt for alternatives. Overall, owners rate the Raven Custom - 39mm GMT Diver highly for its wearability and value.
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