Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Praesidus A-11 SAIT?

At MSRP the Praesidus A-11 SAIT is the cheaper of the two at $300, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,468 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Praesidus A-11 SAIT?

The Serica Ref. 5303 Diving Chronometer wears larger at 39mm versus 38mm for the Praesidus A-11 SAIT — a 1mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Praesidus A-11 SAIT?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 100m for the Praesidus A-11 SAIT.

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Praesidus A-11 SAIT?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Praesidus A-11 SAIT.

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Praesidus A-11 SAIT?

Both watches run automatic movements — the Serica Ref. 5303 Diving Chronometer uses the M100 COSC and the Praesidus A-11 SAIT uses the Seiko NH35.

Side by side

Serica Ref. 5303 Diving ChronometervsPraesidus A-11 SAIT

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

Praesidus A-11 SAIT

P-38-SA-MB-SDCSG

MSRP $300

At a glance

14 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

A-11 SAIT38mm

Power Reserve

Ref. 5303 Diving Chronometer42h

A-11 SAIT40h

Water Resistance

Ref. 5303 Diving Chronometer300m

A-11 SAIT100m

MSRP

Ref. 5303 Diving Chronometer$1,768

A-11 SAIT$300

Full specifications

Case

7 specs

Crystal & Dial

3 specs

AR Coating

Yes

Inner

Dial Color

Enamel Black

SAIT

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

$300

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