Side by side

Serica Ref. 5303 Diving ChronometervsFortis Novonaut N-42

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
Novonaut N-42
FortisNovonaut N-42
MSRP $5,230

At a glance

14 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Novonaut N-4242mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Novonaut N-4260h
Water Resistance
Ref. 5303 Diving Chronometer300m
Novonaut N-42300m
MSRP
Ref. 5303 Diving Chronometer$1,768
Novonaut N-42$5,230

Full specifications

Case

6 specs
Category
Diver
Chronograph
Diameter
39mm
42mm
Thickness
12.2mm
14.6mm
Lug-to-Lug
46.5mm
Lug Width
20mm
21mm
Material
Stainless Steel
Titanium / Stainless Steel

Crystal & Dial

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

Movement

4 specs
Caliber
M100 COSC
Manufacture Caliber WERK 17
Power Reserve
42h
60h
Jewels
25
36
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$5,230

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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.

Fortis Novonaut N-42

Owners widely praise the Fortis B-42 Official Cosmonauts for its stunning fit and finish, excellent legibility, and a precise, grippy bezel, with one owner calling its bracelet the nicest they've ever owned. The Fortis Novonaut N-42 is described as a flawless beast with a WERK 17 column-wheel chronograph movement, featuring enhanced shock resistance and COSC adjustment, and is noted as a handsome tool watch with a beautiful dial and nice pusher action. However, the 42mm case of the B-42 wears larger than expected, and the Novonaut's 44mm case and chunky bracelet make it too large and heavy for many. The Fortis Titanium Legacy is a modern pilot's watch with a titanium case and bracelet, featuring a Kenissi WERK 13 movement with a 70-hour power reserve and three time zones. Overall, owners and reviewers highly regard the Fortis Titanium Legacy for its robust tool watch design and advanced movement technology, despite some concerns about case size and bracelet adjustability.

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