Side by side

Serica Ref. 5303 Diving ChronometervsBoldr Expedition II

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
Expedition II
BoldrExpedition II
MSRP $699

At a glance

10 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Expedition II41mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Expedition II38h
Water Resistance
Ref. 5303 Diving Chronometer300m
Expedition II200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Expedition II$699

Full specifications

Case

5 specs
Category
Diver
Tool
Diameter
39mm
41mm
Thickness
12.2mm
14mm
Lug-to-Lug
46.5mm
48mm
Water Resistance
300m
200m

Crystal & Dial

1 specs
Dial Color
Enamel Black
I Eiger

Movement

3 specs
Caliber
M100 COSC
Sellita SW200-1
Power Reserve
42h
38h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$699

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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 Expedition II

Owners widely praise the Boldr Expedition II for its tool watch utility, legible dials, and bead-blasted finish, with many finding its 41mm size ideal for daily wear and comfortable on various wrists. Reviewers and owners alike highlight its excellent value, well-executed details, and the functional design of its knurled crown. Some owners note the dial color can appear creamier than expected online, and one reviewer found the stock rubber strap to be a minor criticism. The Sellita SW200 movement and domed sapphire crystal are also noted as positive features. On balance, owners and reviewers rate the Boldr Expedition II highly for its functional field watch design and excellent value.

From video reviewers

The Boldr Expedition II's solid construction and reliability are notable strengths. A weakness is the potential for dim lume brightness, as the entire dial is fully covered in lume but the reviewer's assessment implies it might be inadequate.

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