5303-1 Dive Chronometer

Ref. 5303-1

Case diameter: 39 mm; Manufacturer spec
Lug-to-lug: 46.5 mm; Manufacturer spec
Thickness: 12.2 mm; Manufacturer spec
Lug width: 20 mm; Manufacturer spec

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 46.5 mm

How the 5303-1 Dive Chronometer wears

Its lugs add 7.5 mm to the 39 mm case, close to the 7.1 mm typical across the almanac, so its diameter is a fair guide to how it wears.

On our fit model it sits best on wrists from 6.5" to 7.75" (16.5–19.7 cm); below 6.5" the lugs start to reach the edge of the wrist.

At 12.2 mm thick it is slimmer than 78% of the 79 other dive watches we've measured, so it slides under a cuff more easily than most.

Its 20 mm lug width is one of the most common strap sizes; 104 other watches here share it, so aftermarket straps are easy to find.

Will the 5303-1 Dive Chronometer fit your wrist?

With a 46.5 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.

Wrist	Flat width (est.)	Fit
6"	47.2 mm	Lugs overhang
6.5"	51.2 mm	Ideal fit
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Wears small

Specifications

Reference: 5303-1
Collection: 5303
Status: In production
Case material: stainless steel
Crystal: sapphire
Water resistance: 300 m
Bezel: unidirectional, black enamel-finish ceramic insert
Dial: black
Strap / bracelet: Vesper mesh bracelet
Style: Dive

Movement

Caliber: Soprod Soprod M100
Type: automatic
Power reserve: 42 hours
Frequency: 28,800 vph (4 Hz)
Jewels: 25
Accuracy: COSC chronometer

Takes 20 mm straps. See other 20 mm watches and straps.

Watches that wear the same size

Other watches within 1.5 mm of its lug-to-lug.

Same 20 mm lug width

All 20 mm watches

These take the same straps as the 5303-1 Dive Chronometer.

Sources

serica-watches.com/products/5303-1-chronometre-plongee