Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Hemel HD24 Automatic?

At MSRP the Hemel HD24 Automatic is the cheaper of the two at $300, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,468 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Hemel HD24 Automatic?

The Hemel HD24 Automatic 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 HD24 Automatic?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 200m for the Hemel HD24 Automatic.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Hemel HD24 Automatic?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Hemel HD24 Automatic.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Hemel HD24 Automatic?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Hemel HD24 Automatic uses the Seiko NH38A.

Side by side

Serica Ref. 5303 Diving ChronometervsHemel HD24 Automatic

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 HD24 Automatic

the-gallant

MSRP $300

At a glance

13 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

HD24 Automatic40mm

Power Reserve

Ref. 5303 Diving Chronometer42h

HD24 Automatic40h

Water Resistance

Ref. 5303 Diving Chronometer300m

HD24 Automatic200m

MSRP

Ref. 5303 Diving Chronometer$1,768

HD24 Automatic$300

Full specifications

Case

5 specs

Diameter

39mm

40mm

Thickness

12.2mm

13mm

Lug-to-Lug

46.5mm

48mm

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

Gallant USAF Edition

Lume

Super-LumiNova

None

Movement

3 specs

Caliber

M100 COSC

Seiko NH38A

Power Reserve

42h

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$300

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