Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Sheffield 1A SCR II Blue?

At MSRP the Sheffield 1A SCR II Blue is the cheaper of the two at $278, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,490 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Sheffield 1A SCR II Blue?

The Sheffield 1A SCR II Blue 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 1A SCR II Blue?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 200m for the Sheffield 1A SCR II Blue.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Sheffield 1A SCR II Blue?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Sheffield 1A SCR II Blue.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Sheffield 1A SCR II Blue?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Sheffield 1A SCR II Blue uses the Seiko NH35.

Side by side

Serica Ref. 5303 Diving ChronometervsSheffield 1A SCR II Blue

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 SCR II Blue

1a-scr-ii-blue

MSRP $278

At a glance

12 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

1A SCR II Blue40mm

Power Reserve

Ref. 5303 Diving Chronometer42h

1A SCR II Blue40h

Water Resistance

Ref. 5303 Diving Chronometer300m

1A SCR II Blue200m

MSRP

Ref. 5303 Diving Chronometer$1,768

1A SCR II Blue$278

Full specifications

Case

5 specs

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

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

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Serica Ref. 5303 Diving ChronometervsSheffield 1A SCR II Blue

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