Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Praesidus Neptune 44?

At MSRP the Praesidus Neptune 44 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 Praesidus Neptune 44?

The Praesidus Neptune 44 wears larger at 44mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 5mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Praesidus Neptune 44?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 200m for the Praesidus Neptune 44.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Praesidus Neptune 44?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Praesidus Neptune 44.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Praesidus Neptune 44?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Praesidus Neptune 44 uses the Miyota 9039.

Side by side

Serica Ref. 5303 Diving ChronometervsPraesidus Neptune 44

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

Praesidus Neptune 44

neptune-44-brown

MSRP $550

At a glance

14 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

Neptune 4444mm

Power Reserve

Ref. 5303 Diving Chronometer42h

Neptune 4440h

Water Resistance

Ref. 5303 Diving Chronometer300m

Neptune 44200m

MSRP

Ref. 5303 Diving Chronometer$1,768

Neptune 44$550

Full specifications

Case

6 specs

Diameter

39mm

44mm

Thickness

12.2mm

—

Lug-to-Lug

46.5mm

—

Lug Width

20mm

22mm

Material

Stainless Steel

316L Stainless Steel

Water Resistance

300m

200m

Crystal & Dial

4 specs

Crystal

Sapphire

Domed Sapphire

AR Coating

Yes

Inner

Dial Color

Enamel Black

Patina

Lume

Super-LumiNova

None

Movement

3 specs

Caliber

M100 COSC

Miyota 9039

Power Reserve

42h

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$550

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