Side by side

Serica Ref. 5303 Diving ChronometervsSeiko Prospex Sea PADI Special Edition

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
Prospex Sea PADI Special Edition
SeikoProspex Sea PADI Special Edition
MSRP $650

At a glance

13 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Prospex Sea PADI Special Edition45mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Prospex Sea PADI Special Edition41h
Water Resistance
Ref. 5303 Diving Chronometer300m
Prospex Sea PADI Special Edition200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Prospex Sea PADI Special Edition$650

Full specifications

Case

5 specs
Diameter
39mm
45mm
Thickness
12.2mm
13.2mm
Lug-to-Lug
46.5mm
47.7mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

3 specs
AR Coating
Yes
Anti-reflective coating on inner surface
Dial Color
Enamel Black
Black
Lume
Super-LumiNova
LumiBrite on hands, index(es) and bezel

Movement

4 specs
Caliber
M100 COSC
4R36
Power Reserve
42h
41h
Jewels
25
24
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$650

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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 Prospex Sea PADI Special Edition

Owners widely praise the Seiko Prospex Sea PADI Special Edition for its robust build quality, excellent bezel action, and strong lume that performs well in low light. Reviewers note specific models feature attractive dials, such as the jewel-toned teal with a water pattern or a deep dark blue gradient. Some owners highlight the comfortable wearability and solid bracelets. The 4R36 movement is mentioned with a 41-hour power reserve, while the 6R55 movement offers a 72-hour power reserve and a stated accuracy of +25/-15 seconds per day. One owner finds the multi-lingual date function and divers extension difficult to use, and bracelet adjustment can be initially frustrating. On balance, owners and reviewers rate the Seiko Prospex Sea PADI Special Edition highly for its dive watch functionality and attractive dial designs.

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