Side by side
Serica Ref. 5303 Diving ChronometervsCore Timepieces The River Watch
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
13 of 29 specs differDiameter
Ref. 5303 Diving Chronometer39mm
The River Watch42mm
Power Reserve
Ref. 5303 Diving Chronometer42h
The River Watch—
Water Resistance
Ref. 5303 Diving Chronometer300m
The River Watch300m
MSRP
Ref. 5303 Diving Chronometer$1,768
The River Watch$540
Full specifications
Case
6 specsCategory
Diver
—
Diameter
39mm
42mm
Thickness
12.2mm
—
Lug-to-Lug
46.5mm
—
Lug Width
20mm
22mm
Material
Stainless Steel
Titanium
Crystal & Dial
3 specsAR Coating
Yes
Inner
Dial Color
Enamel Black
—
Lume
Super-LumiNova
None
Movement
3 specsCaliber
M100 COSC
Seiko NH34A
Power Reserve
42h
—
Complications
COSC
None
Pricing
1 specsMSRP
$1,768
—
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