Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Hemel HFC Mechanical Chronograph?

At MSRP the Hemel HFC Mechanical Chronograph 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 Hemel HFC Mechanical Chronograph?

The Hemel HFC Mechanical Chronograph wears larger at 40mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 1mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Hemel HFC Mechanical Chronograph?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 100m for the Hemel HFC Mechanical Chronograph.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Hemel HFC Mechanical Chronograph?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Hemel HFC Mechanical Chronograph.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Hemel HFC Mechanical Chronograph?

The Serica Ref. 5303 Diving Chronometer runs a automatic caliber (M100 COSC), while the Hemel HFC Mechanical Chronograph runs a manual (Seagull ST19).

Side by side

Serica Ref. 5303 Diving ChronometervsHemel HFC Mechanical Chronograph

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

Hemel HFC Mechanical Chronograph

the-airfoil

MSRP $550

At a glance

15 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

HFC Mechanical Chronograph40mm

Power Reserve

Ref. 5303 Diving Chronometer42h

HFC Mechanical Chronograph40h

Water Resistance

Ref. 5303 Diving Chronometer300m

HFC Mechanical Chronograph100m

MSRP

Ref. 5303 Diving Chronometer$1,768

HFC Mechanical Chronograph$550

Full specifications

Case

6 specs

Crystal & Dial

4 specs

Crystal

Sapphire

Domed Sapphire

AR Coating

Yes

Inner

Dial Color

Enamel Black

Airfoil (1970s British Pilot)

Lume

Super-LumiNova

None

Movement

4 specs

Caliber

M100 COSC

Seagull ST19

Type

Automatic

Manual

Power Reserve

42h

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$550

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