CWC RN81 Diver AutomaticvsHalios Seaforth IV
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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.

RN81 Diver Automatic

Seaforth IV
Diameter
41mm
40mm
Lug-to-Lug
47mm
46.5mm
lowest
Thickness
12.7mm
12.4mm
lowest
Water Resistance
300m
highest
200m
MSRP
$2,858
$765
lowest
Movement
Sellita SW200-1
Sellita SW200-1
Case
5 specsCrystal & Dial
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the CWC (Cabot Watch Company) RN81 Diver Automatic Watch for its robust build and preferred dial layout, featuring an iconic big triangle and sword hands reminiscent of the 1980 original. The bezel action is described as nice and chunky, and the case wears beautifully. Some reviewers note the polished case sides and "faux patina" lume color as unusual or slightly glossy for a military-issued watch, and fixed springbars are flagged as a potential drawback. Accuracy varies, with one owner reporting it running 3 seconds fast per 24 hours. On balance, owners and reviewers appreciate the CWC (Cabot Watch Company) RN81 Diver Automatic Watch for its faithful homage design and solid construction, despite some reservations about its finishing and price point.
Owners widely praise the Halios Seaforth IV's wearability on smaller wrists, citing its manageable 40mm case and 47mm lug-to-lug distance. Admiration is frequently directed towards the sunburst blue dial and the well-executed lume on the sapphire bezel. Some owners find the steel bracelet bland on stainless steel variants, and a few express a desire for white dials or larger case sizes. One owner notes the sapphire bezel is flat and taller than preferred. On balance, owners rate the Halios Seaforth IV highly for its accessible size and quality finishing at its price point.
The sunburst blue dial is a standout feature. Limited water resistance is a shared concern.
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