Side by side

Serica Ref. 5303 Diving ChronometervsSternglas Naos Pro Automatik

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
Naos Pro Automatik
SternglasNaos Pro Automatik
MSRP $755

At a glance

13 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Naos Pro Automatik38mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Naos Pro Automatik42h
Water Resistance
Ref. 5303 Diving Chronometer300m
Naos Pro Automatik50m
MSRP
Ref. 5303 Diving Chronometer$1,768
Naos Pro Automatik$755

Full specifications

Case

5 specs
Category
Diver
Dress
Diameter
39mm
38mm
Thickness
12.2mm
9mm
Lug-to-Lug
46.5mm
42.4mm
Water Resistance
300m
50m

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Lume
Super-LumiNova
Luminova Punkte

Movement

4 specs
Caliber
M100 COSC
Miyota 9015
Power Reserve
42h
42h
Jewels
25
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$755

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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.

Sternglas Naos Pro Automatik

The Sternglas Naos Pro Automatik is praised for its slim 9mm case and Bauhaus dial design, featuring clear hour markers and a framed date window. Owners note the upgraded Miyota 9015 movement with a 4Hz beat rate. Accuracy is reported as -10/+30 seconds per day, which is not ideal for precision enthusiasts. The five-link bracelet's lack of fitted end-links and the optional bracelet's chunkiness are flagged as areas lacking refinement. Overall, reviewers highlight the Sternglas Naos Pro Automatik's improved wearability and premium feel at its price point.

From video reviewers

The Bauhaus design is a strength. The value proposition is a weakness.

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