Side by side

Serica Ref. 5303 Diving ChronometervsBoldr Expedition Enigmath

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 Enigmath
BoldrExpedition Enigmath
MSRP $599

At a glance

9 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Expedition Enigmath41mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Expedition Enigmath42h
Water Resistance
Ref. 5303 Diving Chronometer300m
Expedition Enigmath200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Expedition Enigmath$599

Full specifications

Case

5 specs
Category
Diver
Tool
Diameter
39mm
41mm
Thickness
12.2mm
12.8mm
Lug-to-Lug
46.5mm
47.5mm
Water Resistance
300m
200m

Crystal & Dial

1 specs
Dial Color
Enamel Black
Enigmath Coconino

Movement

2 specs
Caliber
M100 COSC
Miyota 9039,
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$599

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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 Enigmath

The watch's slide rule function is a convenient feature, allowing for calculations on the go. One potential drawback is the use of the Japanese Miyota 9039 movement, which may be a trade-off for some buyers. Reviewers disagree on whether the quick 'on the fly' adjust bracelet is a more significant advantage than the watch's sapphire crystal for durability and scratch resistance.

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