Raven Custom - 39mm GMT DivervsSeiko Prospex Sea 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.

Raven Custom - 39mm GMT Diver at true scale

Custom - 39mm GMT Diver

Seiko Prospex Sea 1965 Heritage Diver's Watch at true scale

Prospex Sea 1965 Heritage Diver's Watch

Diameter

39mm

40mm

Lug-to-Lug

n/a

46.4mm

Thickness

n/a

13mm

Water Resistance

200m

300m

highest

Power Reserve

n/a

72h

MSRP

$590

lowest

$1,300

Movement

Seiko NH34

Seiko 6R55

Case

5 specs
Diameter
39mm
40mm
Thickness
n/a
13mm
Lug-to-Lug
n/a
46.4mm
Material
Ceramic
Stainless Steel
Water Resistance
200m
300m

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
n/a
n/a
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Seiko NH34
Seiko 6R55
Power Reserve
0h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$590
$1,300
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Reviews

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

Raven Custom - 39mm GMT Diver

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.

Seiko Prospex Sea 1965 Heritage Diver's Watch

Owners widely praise the Seiko Prospex Sea 1965 Heritage Diver's Watch for its refined engineering, comfortable 40mm case, and improved 300m water resistance. The watch is noted for its better build quality and finishing compared to some alternatives, featuring a mix of polished and brushed surfaces, with specific callouts for the jewel-toned teal dial with a rippling-water pattern. Some owners consider the price fair, while others suggest it is too high. Accuracy figures vary, with some owners reporting their 6R55 movement performs well within +/- 10 seconds per day, while others note theirs runs slow or have concerns about QC for the price. The bracelet, while improved, lacks modern features like quick-release or extensive micro-adjustments. Overall, owners and reviewers rate the Seiko Prospex Sea 1965 Heritage Diver's Watch highly for its refined design and build quality at its price point.