Side by side

Serica Ref. 5303 Diving ChronometervsCWC RN Quartz Divers Watch Mk.2, Matte Top

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Ref. 5303 Diving Chronometer
SericaRef. 5303 Diving Chronometer
MSRP $1,768
RN Quartz Divers Watch Mk.2, Matte Top
CWCRN Quartz Divers Watch Mk.2, Matte Top
MSRP $604

At a glance

9 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
RN Quartz Divers Watch Mk.2, Matte Top41mm
Power Reserve
Ref. 5303 Diving Chronometer42h
RN Quartz Divers Watch Mk.2, Matte Top40h
Water Resistance
Ref. 5303 Diving Chronometer300m
RN Quartz Divers Watch Mk.2, Matte Top300m
MSRP
Ref. 5303 Diving Chronometer$1,768
RN Quartz Divers Watch Mk.2, Matte Top$604

Full specifications

Case

3 specs
Diameter
39mm
41mm
Thickness
12.2mm
12mm
Lug-to-Lug
46.5mm
47mm

Crystal & Dial

1 specs
Dial Color
Enamel Black
CWC RN Quartz Divers Watch Mk.2, Matte Top (RN300-MT QS120)

Movement

4 specs
Caliber
M100 COSC
Ronda 517
Type
Automatic
Quartz
Power Reserve
42h
40h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$604

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What people say

Owners + reviewers, side by side

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

Serica Ref. 5303 Diving Chronometer

Owners widely praise the Serica Ref. 5303 Diving Chronometer for its excellent wearability, definitive style, and smooth, confident bezel action. The dual scale on the bezel is noted as surprisingly useful, and the crown action, winding, and hacking are reported to work perfectly. One owner describes the Serica 5303-3 as gorgeous and unique, though another notes the crown can appear comically large. On balance, owners rate the Serica Ref. 5303 Diving Chronometer highly for its blend of unique design and robust functionality.

CWC RN Quartz Divers Watch Mk.2, Matte Top

Owners widely praise the CWC RN Quartz Divers Watch Mk.2, Matte Top for its excellent matte case finishing, precise seconds hand alignment, and dial reminiscent of vintage military watches. The Mk.2 upgrades, including a sapphire crystal, improved lume, and a precise 120-click bezel described as perfection with no play, are consistently highlighted as significant improvements over earlier versions. One owner noted the quartz movement gained 8 seconds over several months. Overall, owners rate the CWC RN Quartz Divers Watch Mk.2, Matte Top highly for its solid construction, military significance, and terrific value.

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