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Owners widely praise the Serica Ref. 5303 Diving Chronometer for its excellent wearability, definitive style, and smooth, confident bezel action. The dual scale on the bezel is noted as surprisingly useful, and the crown action, winding, and hacking are reported to work perfectly. One owner describes the Serica 5303-3 as gorgeous and unique, though another notes the crown can appear comically large. On balance, owners rate the Serica Ref. 5303 Diving Chronometer highly for its blend of unique design and robust functionality.
Ref. 5303 Diving Chronometer
3 Variants
Lume:Super-LumiNova
Retail MSRP
$1,768
Low
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Avg
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High
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Static data
Case
39mm
Power Reserve
42h
Movement
Automatic
Water Resistance
300m
01
Case Dimensions
Diameter39mm
Thickness12.2mm
Lug-to-Lug46.5mm
Lug Width—
02
Case Build
MaterialStainless Steel
Water Resistance300m
03
Crystal & Dial
CrystalSapphire
AR CoatingYes
Dial ColorEnamel Black
LumeSuper-LumiNova
04
Movement
Caliber
TypeAutomatic
Beat Rate—
Power Reserve42 hours
Jewels—
HackingNo
Hand-WindingNo
ComplicationsCOSC
05
Design Language
Dial styleMatte
BezelRotating (dive)
Bracelet / strapLug-attached bracelet
HandsMercedes
AI-detected from product image · 5/22/2026
In a nutshell
The Serica Ref. 5303 Diving Chronometer (ref. 5303-1-diving-chronometer) is an automatic diver watch, with a 39mm stainless steel case, 12.2mm thick, powered by the M100 COSC movement and a 42-hour power reserve. Water resistance is rated to 300m, under a sapphire crystal, with cosc complications. Manufacturer MSRP is $1,768. The dial color is enamel black.