Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)?

At MSRP the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap) is the cheaper of the two at $223, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,545 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)?

The Serica Ref. 5303 Diving Chronometer wears larger at 39mm versus 38mm for the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap) — a 1mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 200m for the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap).

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap) uses the Seiko NH35.

Side by side

Serica Ref. 5303 Diving ChronometervsSheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)

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

Add a watch

Serica Ref. 5303 Diving Chronometer

5303-1-diving-chronometer

MSRP $1,768

Sheffield 1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)

MSRP $223

At a glance

11 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)38mm

Power Reserve

Ref. 5303 Diving Chronometer42h

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)—

Water Resistance

Ref. 5303 Diving Chronometer300m

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)200m

MSRP

Ref. 5303 Diving Chronometer$1,768

1A 38 dive 38mm, 3-hand date (rotating dive bezel, perforated rubber strap)$223

Full specifications

Case

4 specs

Diameter

39mm

38mm

Thickness

12.2mm

12.8mm

Lug-to-Lug

46.5mm

46mm

Water Resistance

300m

200m

Crystal & Dial

3 specs

AR Coating

Yes

Inner

Dial Color

Enamel Black

Blue

Lume

Super-LumiNova

None

Movement

3 specs

Caliber

M100 COSC

Seiko NH35

Power Reserve

42h

—

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$223

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At a glance

Full specifications

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