Side by side

Serica Ref. 5303 Diving ChronometervsTornek-Rayville TR-660 Sapphire Non-date

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
TR-660 Sapphire Non-date
Tornek-RayvilleTR-660 Sapphire Non-date

At a glance

10 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
TR-660 Sapphire Non-date40mm
Power Reserve
Ref. 5303 Diving Chronometer42h
TR-660 Sapphire Non-date50h
Water Resistance
Ref. 5303 Diving Chronometer300m
TR-660 Sapphire Non-date200m
MSRP
Ref. 5303 Diving Chronometer$1,768
TR-660 Sapphire Non-date

Full specifications

Case

4 specs
Diameter
39mm
40mm
Thickness
12.2mm
14.7mm
Lug-to-Lug
46.5mm
48.5mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
Dial Color
Enamel Black
Black
Lume
Super-LumiNova
Superluminova

Movement

3 specs
Caliber
M100 COSC
TMI NH38
Power Reserve
42h
50h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768

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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.

Tornek-Rayville TR-660 Sapphire Non-date

Owners widely praise the Tornek-Rayville TR-660 for its quality, good timekeeping, and suitability as a military diver reissue. The 40mm bead-blasted 316L stainless steel case, sapphire bezel inlay, and Arclite Super LumiNova are noted features, powered by a Japanese TMI NH38 automatic movement and water-resistant to 20 ATMs. Some owners suggest alternatives due to availability issues with the small-batch releases. Overall, owners rate the Tornek-Rayville TR-660 highly for its faithful reissue design and quality build at its price point.

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