Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Orient AK04 Field Sport Watch?

At MSRP the Orient AK04 Field Sport Watch is the cheaper of the two at $325, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,443 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Orient AK04 Field Sport Watch?

The Orient AK04 Field Sport Watch wears larger at 42.4mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 3.4mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Orient AK04 Field Sport Watch?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 100m for the Orient AK04 Field Sport Watch.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Orient AK04 Field Sport Watch?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Orient AK04 Field Sport Watch.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Orient AK04 Field Sport Watch?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Orient AK04 Field Sport Watch uses the F6B22.

Side by side

Serica Ref. 5303 Diving ChronometervsOrient AK04 Field Sport Watch

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

Orient AK04 Field Sport Watch

ra-ak0401l30b

MSRP $325

At a glance

17 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

AK04 Field Sport Watch42.4mm

Power Reserve

Ref. 5303 Diving Chronometer42h

AK04 Field Sport Watch40h

Water Resistance

Ref. 5303 Diving Chronometer300m

AK04 Field Sport Watch100m

MSRP

Ref. 5303 Diving Chronometer$1,768

AK04 Field Sport Watch$325

Full specifications

Case

5 specs

Crystal & Dial

6 specs

Crystal

Sapphire

Mineral

Crystal Shape

Flat

—

AR Coating

Yes

—

Dial Color

Enamel Black

Blue

Indices

Applied

—

Lume

Super-LumiNova

None

Movement

5 specs

Caliber

M100 COSC

F6B22

Beat Rate

28,800 vph

21,600 vph

Power Reserve

42h

40h

Jewels

Complications

COSC

GMT, Day-date

Pricing

1 specs

MSRP

$1,768

$325

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