Side by side

Serica Ref. 5303 Diving ChronometervsMarathon MSAR (Medium Search & Rescue) Diver's Quartz

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
MSAR (Medium Search & Rescue) Diver's Quartz
MarathonMSAR (Medium Search & Rescue) Diver's Quartz
MSRP $1,450

At a glance

13 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
MSAR (Medium Search & Rescue) Diver's Quartz36mm
Power Reserve
Ref. 5303 Diving Chronometer42h
MSAR (Medium Search & Rescue) Diver's Quartz40h
Water Resistance
Ref. 5303 Diving Chronometer300m
MSAR (Medium Search & Rescue) Diver's Quartz300m
MSRP
Ref. 5303 Diving Chronometer$1,768
MSAR (Medium Search & Rescue) Diver's Quartz$1,450

Full specifications

Case

5 specs
Diameter
39mm
36mm
Thickness
12.2mm
18mm
Lug-to-Lug
46.5mm
Lug Width
20mm
18mm
Material
Stainless Steel
316L Stainless Steel

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Black
Lume
Super-LumiNova
None

Movement

4 specs
Caliber
M100 COSC
Swiss High-Torque Quartz
Type
Automatic
Quartz
Power Reserve
42h
40h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$1,450

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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.

Marathon MSAR (Medium Search & Rescue) Diver's Quartz

Owners widely praise the Marathon MSAR (Medium Search & Rescue) Diver's Quartz for its tool-like aesthetic, bright tritium lume, and satisfying bezel action, making it enjoyable to handle and use. One owner finds the 36mm case comfortable after an initial adjustment period, while another reports accuracy within a few seconds of atomic time. On balance, owners rate the Marathon MSAR (Medium Search & Rescue) Diver's Quartz highly for its superb value and enjoyable tool-watch characteristics.

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