Side by side

Serica Ref. 5303 Diving ChronometervsTornek-Rayville Blakjak Time-elapse

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
Blakjak Time-elapse
Tornek-RayvilleBlakjak Time-elapse
MSRP $895

At a glance

10 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Blakjak Time-elapse42.5mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Blakjak Time-elapse42h
Water Resistance
Ref. 5303 Diving Chronometer300m
Blakjak Time-elapse200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Blakjak Time-elapse$895

Full specifications

Case

5 specs
Diameter
39mm
42.5mm
Thickness
12.2mm
13.2mm
Lug-to-Lug
46.5mm
49mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

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

Movement

2 specs
Caliber
M100 COSC
SII NH36
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$895

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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 Blakjak Time-elapse

The Tornek-Rayville Blakjak Time-elapse is a rugged, dive-capable field watch, an evolution of a 1990s military concept. It features a 42.5mm stainless steel case, a sapphire crystal, and a Seiko NH36 automatic movement with a 40-hour power reserve. The dial is busy but functional, and the watch features Super-LumiNova BGW9. On balance, reviewers note the Tornek-Rayville Blakjak Time-elapse is a modernized military watch with robust dive capabilities.

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