Side by side

Serica Ref. 5303 Diving ChronometervsHELM Komodo

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
Komodo
HELMKomodo
MSRP $295

At a glance

10 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Komodo40mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Komodo40h
Water Resistance
Ref. 5303 Diving Chronometer300m
Komodo300m
MSRP
Ref. 5303 Diving Chronometer$1,768
Komodo$295

Full specifications

Case

3 specs
Diameter
39mm
40mm
Thickness
12.2mm
15.5mm
Lug-to-Lug
46.5mm
47mm

Crystal & Dial

2 specs
Crystal Shape
Flat
Double-Domed
Dial Color
Enamel Black
Black

Movement

4 specs
Caliber
M100 COSC
Seiko Instruments NH35
Power Reserve
42h
40h
Jewels
25
24
Complications
COSC
Date

Pricing

1 specs
MSRP
$1,768
$295

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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.

HELM Komodo

The HELM Komodo is widely praised for its excellent build quality, top-notch case finishing, clear double-domed sapphire crystal, wonderfully executed dial, and substantial lume, with reviewers noting its ISO 6425 compliance and 300m water resistance. Owners report a snappy 120-click bezel and appreciate the depth, detail, and finishing for a tool diver at its price point. Some owners find the 15.2mm to 15.5mm height makes the HELM Komodo feel thick and hefty, and the bezel ridges are noted as somewhat uncomfortable to turn, while the clasp design is also flagged as a drawback. On balance, owners and reviewers rate the HELM Komodo highly for its exceptional finishing and lume at its sub-$300 price point.

From video reviewers

The HELM Komodo's double domed sapphire crystal offers excellent optical clarity and minimal distortion. A notable weakness is its limited availability, making it harder to get than some other luxury watches. Reviewers disagree on the watch's lug-to-lug fit, with one reviewer noting it may not suit those with smaller wrists, while another reviewer does not mention this as a concern.

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