Side by side

Serica Ref. 5303 Diving ChronometervsHamilton American Classic Valiant Auto

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
American Classic Valiant Auto
HamiltonAmerican Classic Valiant Auto
MSRP $645

At a glance

13 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
American Classic Valiant Auto34mm
Power Reserve
Ref. 5303 Diving Chronometer42h
American Classic Valiant Auto80h
Water Resistance
Ref. 5303 Diving Chronometer300m
American Classic Valiant Auto50m
MSRP
Ref. 5303 Diving Chronometer$1,768
American Classic Valiant Auto$645

Full specifications

Case

6 specs
Category
Diver
Dress
Diameter
39mm
34mm
Thickness
12.2mm
10.58mm
Lug-to-Lug
46.5mm
46mm
Lug Width
20mm
16mm
Water Resistance
300m
50m

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Silver
Lume
Super-LumiNova
None

Movement

3 specs
Caliber
M100 COSC
H-10
Power Reserve
42h
80h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$645

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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.

Hamilton American Classic Valiant Auto

Owners widely praise the Hamilton American Classic Valiant Auto for its classic design elements, such as the sunburst dial and Roman numerals, noting its suitability for everyday elegance and wearability under a cuff. One owner highlights the 39.5mm size and applied indices as a "hidden gem," while another appreciates the clean, simple design with thin Roman numerals. The watch is also commended for its comfortable bracelet and attractive lance hands, with confirmation that the bracelet is indeed changeable. Some owners note the date window's placement at three o'clock is a point of contention, and one owner reports the watch runs at approximately +6 seconds per day after ten years of intermittent use. On balance, owners rate the Hamilton American Classic Valiant Auto highly for its elegant, classic design and comfortable wearability at its price point.

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