CWC [VAULT] CWC RN81 Diver Automatic WatchvsSeiko Prospex LX line

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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.

CWC [VAULT] CWC RN81 Diver Automatic Watch at true scale

[VAULT] CWC RN81 Diver Automatic Watch

Seiko Prospex LX line at true scale

Prospex LX line

Diameter

45mm

44.8mm

Lug-to-Lug

47mm

lowest

50.9mm

Thickness

12.7mm

lowest

15.7mm

Water Resistance

300m

300m

Power Reserve

n/a

72h

MSRP

$1,792

lowest

$6,500

Movement

Sellita SW200-1

Seiko 5R65

Case

5 specs
Diameter
45mm
44.8mm
Thickness
12.7mm
15.7mm
Lug-to-Lug
47mm
50.9mm
Lug Width
20mm
22mm
Material
Stainless Steel
Titanium

Crystal & Dial

3 specs
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
n/a
n/a
Lume
None
LumiBrite on hands and index(es)

Movement

4 specs
Caliber
Sellita SW200-1
Seiko 5R65
Type
Automatic
Spring Drive
Power Reserve
0h
72h
Jewels
0
30

Pricing

1 specs
MSRP
$1,792
$6,500
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Reviews

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

CWC [VAULT] CWC RN81 Diver Automatic Watch

Owners widely praise the CWC RN81 Diver Automatic Watch for its vintage-inspired aesthetic, milspec bezel, and lume details, with many finding it incredibly legible even in the dark. The watch is considered great value for its price, featuring top-notch crown, bezel, and case finishing, and has proven durable, surviving accidental drops. Some owners find the case a bit thick and large, and one owner prefers the PVD finish over the polished case. Overall, owners rate the CWC RN81 Diver Automatic Watch highly for its legibility and robust build at its price point.

Seiko Prospex LX line

Owners widely praise the Seiko Prospex LX line for its exceptional finishing, with Zaratsu polishing and mirror-quality high-polish surfaces on the titanium case, often described as superior to the Marinemaster 300. Reviewers highlight the impressive Spring Drive 5R65 movement, noting accuracy as good as +/- 1 second per day. The watch is considered wearable despite its 44.8mm size, with some owners finding its case sits better on the wrist than other models. However, the high MSRP is a recurring point of contention, with some owners feeling it limited sales and alienated the target market, leading to discussions about potential quality control issues and fragility in some instances. The bracelet on the dive watch variant is noted as lacking a polished bevel edge found on other models in the line. Some owners expressed a desire for smaller case sizes to accompany a reduced price.