Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Oak & Oscar The Humboldt GMT USSS Edition?

At MSRP the Serica Ref. 5303 Diving Chronometer is the cheaper of the two at $1,768, against $2,200 for the Oak & Oscar The Humboldt GMT USSS Edition — a $432 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Oak & Oscar The Humboldt GMT USSS Edition?

The Oak & Oscar The Humboldt GMT USSS Edition wears larger at 39.5mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 0.5mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Oak & Oscar The Humboldt GMT USSS Edition?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 200m for the Oak & Oscar The Humboldt GMT USSS Edition.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Oak & Oscar The Humboldt GMT USSS Edition?

The Oak & Oscar The Humboldt GMT USSS Edition carries a 56 hours-hour power reserve against 42 hours on the Serica Ref. 5303 Diving Chronometer.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Oak & Oscar The Humboldt GMT USSS Edition?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Oak & Oscar The Humboldt GMT USSS Edition uses the Sellita SW330.

Side by side

Serica Ref. 5303 Diving ChronometervsOak & Oscar The Humboldt GMT USSS Edition

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

Oak & Oscar The Humboldt GMT USSS Edition

HMBDLTGMTUSSS

MSRP $2,200

At a glance

15 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

The Humboldt GMT USSS Edition39.5mm

Power Reserve

Ref. 5303 Diving Chronometer42h

The Humboldt GMT USSS Edition56 hoursh

Water Resistance

Ref. 5303 Diving Chronometer300m

The Humboldt GMT USSS Edition200m

MSRP

Ref. 5303 Diving Chronometer$1,768

The Humboldt GMT USSS Edition$2,200

Full specifications

Case

7 specs

Crystal & Dial

4 specs

Crystal Shape

Flat

Double-domed

AR Coating

Yes

Inner

Dial Color

Enamel Black

Black

Lume

Super-LumiNova

Super-LumiNova BGW9

Movement

3 specs

Caliber

M100 COSC

Sellita SW330

Power Reserve

42h

56 hoursh

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$2,200

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