CWC RN300 Automatic Diver Mk.1 Tritium With DatevsZelos Spearfish 3
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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.

RN300 Automatic Diver Mk.1 Tritium With Date

Spearfish 3
Diameter
40mm
40mm
Thickness
14.5mm
11.5mm
lowest
Water Resistance
300m
highest
200m
MSRP
$3,174
$799
lowest
Movement
ETA 2824-2
La Joux-Perret G100
Case
4 specsCrystal & Dial
2 specsMovement
1 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) RN300 Automatic Diver Mk.1 Tritium Watch With Date for its robust build, military heritage, and iconic design elements like the big triangle and sword hands, with many finding its case finishing excellent and its bezel action satisfyingly chunky and precise. The watch is noted for its good lume and legibility, and some owners appreciate its polished steel finish and vintage vibe. Accuracy figures vary, with one owner reporting +1 second per day and another seeing 3 seconds fast over 24 hours. A point of contention for some is the fixed lug bars, which limit strap options, and a few reviewers feel the price has increased significantly, making it harder to justify compared to other brands. Overall, owners and reviewers rate the CWC (Cabot Watch Company) RN300 Automatic Diver Mk.1 Tritium Watch With Date highly for its sturdy, utilitarian design and military significance.
Owners widely praise the Zelos Spearfish 3 for its exceptional finishing, with razor-sharp transitions and polish that exceed expectations for its price point. The 40mm case is noted for its wearability, and the bracelet is considered superb, featuring a tool-less micro-adjustment clasp that is among the best from microbrands. Some owners also highlight the beautiful and unique dials as a significant draw. One owner found the titanium case too light, though later regretted selling it. The Zelos Spearfish 3 uses the La Joux-Perret G100 automatic movement. Overall, owners and reviewers rate the Zelos Spearfish 3 highly for its outstanding finishing and wearability at its price point.
The La Joux Perret G100 movement is a significant strength. The bracelet's refinement is a weakness. Reviewers disagreed on the dial material, with one noting a burnt orange sunburst and another mentioning meteorite.
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