Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Loresum LS04?

The Loresum LS04 wears larger at 39.5mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 0.5mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Loresum LS04?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 50m for the Loresum LS04.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Loresum LS04?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Loresum LS04.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Loresum LS04?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Loresum LS04 uses the Miyota 9015.

Side by side

Serica Ref. 5303 Diving ChronometervsLoresum LS04

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

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Serica Ref. 5303 Diving Chronometer

5303-1-diving-chronometer

MSRP $1,768

Loresum LS04

ls04-rose-gold-plated

At a glance

11 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

LS0439.5mm

Power Reserve

Ref. 5303 Diving Chronometer42h

LS0440h

Water Resistance

Ref. 5303 Diving Chronometer300m

LS0450m

MSRP

Ref. 5303 Diving Chronometer$1,768

LS04—

Full specifications

Case

4 specs

Crystal & Dial

3 specs

AR Coating

Yes

Inner

Dial Color

Enamel Black

Blue Aventurine

Lume

Super-LumiNova

Super-LumiNova® BGW9

Movement

3 specs

Caliber

M100 COSC

Miyota 9015

Power Reserve

42h

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

—

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Serica Ref. 5303 Diving ChronometervsLoresum LS04

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