Side by side

Serica Ref. 5303 Diving ChronometervsOrient RA-AC0K Diver Watch

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Ref. 5303 Diving Chronometer
SericaRef. 5303 Diving Chronometer
MSRP $1,768
RA-AC0K Diver Watch
OrientRA-AC0K Diver Watch
MSRP $455

At a glance

16 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
RA-AC0K Diver Watch43.4mm
Power Reserve
Ref. 5303 Diving Chronometer42h
RA-AC0K Diver Watch40h
Water Resistance
Ref. 5303 Diving Chronometer300m
RA-AC0K Diver Watch200m
MSRP
Ref. 5303 Diving Chronometer$1,768
RA-AC0K Diver Watch$455

Full specifications

Case

5 specs
Diameter
39mm
43.4mm
Thickness
12.2mm
12.8mm
Lug-to-Lug
46.5mm
51mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

5 specs
Crystal Shape
Flat
AR Coating
Yes
Dial Color
Enamel Black
Black
Indices
Applied
Lume
Super-LumiNova
None

Movement

5 specs
Caliber
M100 COSC
F6722
Beat Rate
28,800 vph
21,600 vph
Power Reserve
42h
40h
Jewels
25
22
Complications
COSC
Date

Pricing

1 specs
MSRP
$1,768
$455

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Serica Ref. 5303 Diving Chronometer

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.

Orient RA-AC0K Diver Watch

Owners widely praise the Orient RA-AC0K Diver Watch for exceeding expectations and being a "real" watch. The mechanical movement is noted for keeping great time, running within a handful of seconds fast per day, with some owners considering Orient's budget movements among the best for accuracy. Overall, owners rate the Orient RA-AC0K Diver Watch highly for its surprising quality and reliable timekeeping at its price point.

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