Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Sheffield SCR?

The Sheffield SCR 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 Sheffield SCR?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 200m for the Sheffield SCR.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Sheffield SCR?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Sheffield SCR uses the Seiko NH35.

Side by side

Serica Ref. 5303 Diving ChronometervsSheffield SCR

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

scr-grun

At a glance

11 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

SCR40mm

Power Reserve

Ref. 5303 Diving Chronometer42h

SCR—

Water Resistance

Ref. 5303 Diving Chronometer300m

SCR200m

MSRP

Ref. 5303 Diving Chronometer$1,768

SCR—

Full specifications

Case

4 specs

Diameter

39mm

40mm

Thickness

12.2mm

13mm

Lug-to-Lug

46.5mm

48mm

Water Resistance

300m

200m

Crystal & Dial

3 specs

AR Coating

Yes

Inner

Dial Color

Enamel Black

Green

Lume

Super-LumiNova

Swiss lume

Movement

3 specs

Caliber

M100 COSC

Seiko NH35

Power Reserve

42h

—

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

—

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Serica Ref. 5303 Diving ChronometervsSheffield SCR

At a glance

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