Side by side

Serica Ref. 5303 Diving ChronometervsBoldr Odyssey Freediver

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
Odyssey Freediver
BoldrOdyssey Freediver
MSRP $649

At a glance

8 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Odyssey Freediver40mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Odyssey Freediver40h
Water Resistance
Ref. 5303 Diving Chronometer300m
Odyssey Freediver300m
MSRP
Ref. 5303 Diving Chronometer$1,768
Odyssey Freediver$649

Full specifications

Case

3 specs
Diameter
39mm
40mm
Thickness
12.2mm
14.2mm
Lug-to-Lug
46.5mm
48mm

Crystal & Dial

1 specs
Dial Color
Enamel Black
202

Movement

3 specs
Caliber
M100 COSC
Cal
Power Reserve
42h
40h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$649

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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.

Boldr Odyssey Freediver

The Boldr Odyssey Freediver is praised for its bead-blasted steel case with polished bevels and a custom steel bracelet designed for wrist curvature. Reviewers note its strong legibility, applied details, and vintage-inspired date window on fresh dial colors. The 44mm case is surgical-grade steel with a brushed finish and angular lugs, water-resistant to 300 meters. It houses a Miyota 9075 movement with a jumping local hour function. On balance, reviewers highlight the Boldr Odyssey Freediver's thoughtful case finishing and functional movement with a local hour complication.

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