Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Shiro Kara Daibāzu: Kuro SUB?

At MSRP the Shiro Kara Daibāzu: Kuro SUB is the cheaper of the two at $518, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,250 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Shiro Kara Daibāzu: Kuro SUB?

The Shiro Kara Daibāzu: Kuro SUB 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 Shiro Kara Daibāzu: Kuro SUB?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 100m for the Shiro Kara Daibāzu: Kuro SUB.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Shiro Kara Daibāzu: Kuro SUB?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 41 hours on the Shiro Kara Daibāzu: Kuro SUB.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Shiro Kara Daibāzu: Kuro SUB?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Shiro Kara Daibāzu: Kuro SUB uses the Seiko NH35.

Side by side

Serica Ref. 5303 Diving ChronometervsShiro Kara Daibāzu: Kuro SUB

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

Shiro Kara Daibāzu: Kuro SUB

kuro-sub

MSRP $518

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Buy used on eBay ↗

Buy from Shiro Kara ↗

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At a glance

13 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

Daibāzu: Kuro SUB40mm

Power Reserve

Ref. 5303 Diving Chronometer42h

Daibāzu: Kuro SUB41h

Water Resistance

Ref. 5303 Diving Chronometer300m

Daibāzu: Kuro SUB100m

MSRP

Ref. 5303 Diving Chronometer$1,768

Daibāzu: Kuro SUB$518

Full specifications

Case

6 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

41h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$518

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At a glance

Full specifications

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