Side by side

Marathon Arctic OSAR 36mm AutomaticvsSerica Ref. 5303 Diving Chronometer

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Arctic OSAR 36mm Automatic
MarathonArctic OSAR 36mm Automatic
MSRP $1,200
Ref. 5303 Diving Chronometer
SericaRef. 5303 Diving Chronometer
MSRP $1,768

At a glance

12 of 29 specs differ
Diameter
Arctic OSAR 36mm Automatic36mm
Ref. 5303 Diving Chronometer39mm
Power Reserve
Arctic OSAR 36mm Automatic40h
Ref. 5303 Diving Chronometer42h
Water Resistance
Arctic OSAR 36mm Automatic300m
Ref. 5303 Diving Chronometer300m
MSRP
Arctic OSAR 36mm Automatic$1,200
Ref. 5303 Diving Chronometer$1,768

Full specifications

Case

5 specs
Diameter
36mm
39mm
Thickness
13mm
12.2mm
Lug-to-Lug
43.5mm
46.5mm
Lug Width
18mm
20mm
Material
316L Stainless Steel
Stainless Steel

Crystal & Dial

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

Movement

3 specs
Caliber
Sellita SW220-1
M100 COSC
Power Reserve
40h
42h
Complications
None
COSC

Pricing

1 specs
MSRP
$1,200
$1,768

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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.

Marathon Arctic OSAR 36mm Automatic

The Marathon Arctic OSAR 36mm Automatic is noted for its non-tritium dial option, though some owners prefer the 1-12 numeral layout found on other models. One owner found the 36mm size too small for their wrist. Overall, owners appreciate the Marathon Arctic OSAR 36mm Automatic for its non-tritium dial option.

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.

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