CWC [VAULT] CWC RN81 Diver Automatic WatchvsSeiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition
![[VAULT] CWC RN81 Diver Automatic Watch](/_next/image?url=%2Fimages%2Fwatches%2Fcwc--vault-cwc-rn81-clearance-diver-automatic-watch.png%3Fv%3D1792936160623&w=1536&q=60)
Ref. vault-cwc-rn81-clearance-diver-automatic-watch·MSRP $1,792
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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](/_next/image?url=%2Fimages%2Fwatches%2Fcwc--vault-cwc-rn81-clearance-diver-automatic-watch.png%3Fv%3D1792936160623&w=1536&q=60)
[VAULT] CWC RN81 Diver Automatic Watch

Prospex Sea 1970 Heritage Diver's Black Series Limited Edition
Diameter
45mm
44mm
Lug-to-Lug
47mm
lowest
49.3mm
Thickness
12.7mm
lowest
13mm
Water Resistance
300m
highest
200m
Power Reserve
n/a
50h
MSRP
$1,792
lowest
$3,300
Movement
Sellita SW200-1
Seiko 8L35
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 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.
Owners widely praise the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition for its attractive dial with a jewel-toned teal color and rippling-water pattern, and its smooth bezel action. Some owners find it a refined evolution of previous models with a comfortable case and bracelet. However, a significant number of owners express disappointment with the accuracy of the 6R movement at its price point, with some noting it runs slow. The steep rehaut and marker size make the 24-hour numbers difficult to read, and the case design is described as making the watch feel top-heavy. On balance, owners rate the Seiko Prospex Sea 1970 Heritage Diver's Black Series Limited Edition highly for its striking dial and refined design, despite widespread concerns about the movement's accuracy for the price.
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Also compared
Comparisons nearby in the catalog: alternatives to the watches above paired against the matchup.
![CWC (Cabot Watch Company) [VAULT] CWC RN81 Diver Automatic Watch](/_next/image?url=%2Fimages%2Fwatches%2Fsm%2Fcwc-cabot-watch-company--vault-cwc-rn81-clearance-diver-automatic-watch.png%3Fv%3D1792936166325&w=1536&q=55)







