Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Marathon CeraShell Pilot's Navigator?

At MSRP the Marathon CeraShell Pilot's Navigator is the cheaper of the two at $550, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,218 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Marathon CeraShell Pilot's Navigator?

The Marathon CeraShell Pilot's Navigator wears larger at 41mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 2mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Marathon CeraShell Pilot's Navigator?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 60m for the Marathon CeraShell Pilot's Navigator.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Marathon CeraShell Pilot's Navigator?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Marathon CeraShell Pilot's Navigator.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Marathon CeraShell Pilot's Navigator?

The Serica Ref. 5303 Diving Chronometer runs a automatic caliber (M100 COSC), while the Marathon CeraShell Pilot's Navigator runs a quartz (ETA F06).

Side by side

Serica Ref. 5303 Diving ChronometervsMarathon CeraShell Pilot's Navigator

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

Serica Ref. 5303 Diving Chronometer

5303-1-diving-chronometer

MSRP $1,768

Marathon CeraShell Pilot's Navigator

41mm-cerashell-quartz-navigator-nav-on-ballistic-nylon-strap

MSRP $550

At a glance

14 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

CeraShell Pilot's Navigator41mm

Power Reserve

Ref. 5303 Diving Chronometer42h

CeraShell Pilot's Navigator40h

Water Resistance

Ref. 5303 Diving Chronometer300m

CeraShell Pilot's Navigator60m

MSRP

Ref. 5303 Diving Chronometer$1,768

CeraShell Pilot's Navigator$550

Full specifications

Case

6 specs

Crystal & Dial

3 specs

AR Coating

Yes

Inner

Dial Color

Enamel Black

Black

Lume

Super-LumiNova

None

Movement

4 specs

Caliber

M100 COSC

ETA F06

Type

Automatic

Quartz

Power Reserve

42h

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$550

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