CWC RN Automatic Divers Watch Mk.2vsSeiko Prospex Sea
lug2lug doesn't sell watches. Buy links open the brand's or seller's own site. Some links are affiliate links: lug2lug may earn a commission at no extra cost to you. Disclosures
Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

RN Automatic Divers Watch Mk.2

Prospex Sea
Diameter
41mm
43.8mm
Lug-to-Lug
47mm
lowest
48.7mm
Thickness
n/a
12.8mm
Water Resistance
300m
highest
200m
Power Reserve
n/a
41h
MSRP
$1,249
$625
lowest
Movement
Sellita SW200-1
Seiko 4R35
Case
5 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The CWC RN Automatic Divers Watch Mk.2 is praised for its build quality, utilitarian capabilities, and classic design, with owners appreciating its historical connection to the UK Navy and its suitability as a tool watch. Some find the fixed spring bars a drawback, limiting strap choices. One owner noted average finishing and a chipped polish. The CWC RN Automatic Divers Watch Mk.2 is a 41mm automatic diver with 300m water resistance. On balance, owners view the CWC RN Automatic Divers Watch Mk.2 positively for its heritage and robust tool-watch nature, despite some reservations about its price and finishing.
The Seiko Prospex Sea is widely praised for its excellent value as a sport watch, with owners highlighting its comfortable wearability and generous lume. Reviewers note its solid build quality and attractive design, with some specifically mentioning the matte black dial as a strong point. One owner reports accuracy around +1 to +2 seconds per day. The 43.8mm case size is considered substantial by some, and one owner found the watch heavy and thick, regretting not choosing a different variant. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its blend of classic design and modern utility at an accessible price point.
Similar watches
Matched to the watches above on size, movement, style and price, microbrands first. Open any one to dig in.
Also compared
Comparisons nearby in the catalog: alternatives to the watches above paired against the matchup.








