Side by side

Serica Ref. 5303 Diving ChronometervsSeiko Ice Diver

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
Ice Diver
SeikoIce Diver
MSRP $900

At a glance

12 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Ice Diver45mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Ice Diver70h
Water Resistance
Ref. 5303 Diving Chronometer300m
Ice Diver200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Ice Diver$900

Full specifications

Case

4 specs
Diameter
39mm
45mm
Thickness
12.2mm
12.9mm
Lug-to-Lug
46.5mm
52.6mm
Water Resistance
300m
200m

Crystal & Dial

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

Movement

4 specs
Caliber
M100 COSC
6R35
Power Reserve
42h
70h
Jewels
25
24
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$900

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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.

Seiko Ice Diver

Owners widely praise the Seiko Prospex Sea for its robust build, classic dive watch design, and excellent value, with many highlighting its strong lume and comfortable wearability. Reviewers consistently flag its superior bezel action and overall finishing as standout features for its price point. Some owners find the 43mm case size substantial, with one noting it felt big, thick, and heavy on a 6.5-inch wrist, though others consider it a perfect size. The movement's power reserve is noted as less than newer variants by one reviewer. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its classic design and robust build at an accessible price.

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