Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Sheffield Deep Gray 300?

At MSRP the Sheffield Deep Gray 300 is the cheaper of the two at $258, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,510 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Sheffield Deep Gray 300?

The Sheffield Deep Gray 300 wears larger at 42mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 3mm difference across the dial.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Sheffield Deep Gray 300?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Sheffield Deep Gray 300.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Sheffield Deep Gray 300?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Sheffield Deep Gray 300 uses the Seiko NH35.

Side by side

Serica Ref. 5303 Diving ChronometervsSheffield Deep Gray 300

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 Deep Gray 300

deep-gray-300

MSRP $258

At a glance

12 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

Deep Gray 30042mm

Power Reserve

Ref. 5303 Diving Chronometer42h

Deep Gray 30040h

Water Resistance

Ref. 5303 Diving Chronometer300m

Deep Gray 300300m

MSRP

Ref. 5303 Diving Chronometer$1,768

Deep Gray 300$258

Full specifications

Case

5 specs

Crystal & Dial

3 specs

AR Coating

Yes

Inner

Dial Color

Enamel Black

—

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

—

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Helgraymicro

Follow this matchup

Get a note when Serica Ref. 5303 Diving Chronometer vs Sheffield Deep Gray 300 gets more votes, a community discussion, or a price drop. No account needed.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.

Serica Ref. 5330 Diving Chronometer DatevsSheffield Deep Gray 300 Helgray Poseidon Diver (Automatic)vsSheffield Deep Gray 300 Boldr CharizardvsSheffield Deep Gray 300 Sheffield Deep Gray 300vsBoldr The T Rex By Boldr X Nitecore Serica Ref. 5303 Diving ChronometervsNoctua Watch Corp. PD-1 Serica Ref. 5303 Diving ChronometervsUgly Watch Co 300mD-RedG

Edit this comparison Add another watch Explore more 38–43mm watches

Serica Ref. 5303 Diving ChronometervsSheffield Deep Gray 300

At a glance

Full specifications

More watches worth a look

Poseidon Diver (Automatic)

PD-1

Charizard

300mD-RedG

The T Rex By Boldr X Nitecore

Ω - 01

SOMBRERO 90-011

Duality II - Night Shade LE

Follow this matchup

People also compared