Raven Custom - 39mm GMT DivervsSeiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch
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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.

Custom - 39mm GMT Diver

Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch
Diameter
39mm
39.5mm
Lug-to-Lug
n/a
47.2mm
Thickness
n/a
12.3mm
Water Resistance
200m
200m
Power Reserve
n/a
45h
MSRP
$590
lowest
$2,800
Movement
Seiko NH34
Seiko 6L37
Case
4 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
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.
The Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch is praised for its modern execution of a classic design, with reviewers noting the appealing 39.5mm case size and updated bracelet that improve wearability. Some reviewers mention the 6L37 movement has a 46-hour power reserve, with accuracy rated around -10/+15 seconds per day. A drawback identified by reviewers is the lack of tool-free micro-adjustment on the clasp. Overall, owners and reviewers find the Seiko Prospex Marinemaster Marinemaster 1965 Heritage Diver's Watch to be a handsome re-interpretation of a beloved design, with its improved wearability being a key strength.
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