Side by side

Serica Ref. 5303 Diving ChronometervsCWC Automatic Divers Watch Mk.2 Black

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
Automatic Divers Watch Mk.2 Black
CWCAutomatic Divers Watch Mk.2 Black
MSRP $1,249

At a glance

9 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Automatic Divers Watch Mk.2 Black41mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Automatic Divers Watch Mk.2 Black40h
Water Resistance
Ref. 5303 Diving Chronometer300m
Automatic Divers Watch Mk.2 Black300m
MSRP
Ref. 5303 Diving Chronometer$1,768
Automatic Divers Watch Mk.2 Black$1,249

Full specifications

Case

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

Crystal & Dial

2 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
CWC Automatic Divers Watch Mk.2 Black (SF300 AS120)

Movement

3 specs
Caliber
M100 COSC
Sellita SW200-1
Power Reserve
42h
40h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$1,249

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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 Automatic Divers Watch Mk.2 Black

Owners widely praise the CWC Automatic Divers Watch Mk.2 Black for its brushed chapter ring, precise 120-click bezel, clear sapphire crystal, excellent case finishing, and significantly improved lume. The watch is considered a terrific value with solid construction. Some owners express a preference for a matte finish for a more tool-like appearance, though polished versions offer a dressier look and easier scratch removal. On balance, owners rate the CWC Automatic Divers Watch Mk.2 Black highly for its tool-like features and excellent value.

From video reviewers

The bezel action is smooth. The price has increased due to popularity.

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