Side by side

Serica Ref. 5303 Diving ChronometervsFortis Flieger F-43 Bicompax

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
Flieger F-43 Bicompax
FortisFlieger F-43 Bicompax
MSRP $4,180

At a glance

14 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Flieger F-43 Bicompax43mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Flieger F-43 Bicompax58h
Water Resistance
Ref. 5303 Diving Chronometer300m
Flieger F-43 Bicompax200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Flieger F-43 Bicompax$4,180

Full specifications

Case

6 specs
Category
Diver
Chronograph
Diameter
39mm
43mm
Thickness
12.2mm
14.5mm
Lug-to-Lug
46.5mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

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

Movement

4 specs
Caliber
M100 COSC
Sellita SW510 BH a
Power Reserve
42h
58h
Jewels
25
27
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$4,180

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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 Flieger F-43 Bicompax

Owners widely praise the Fortis Original for its tool-watch aesthetic, legibility, and robust construction, with many noting excellent lume that lasts all night and precise day/date changes at midnight. The brushed stainless steel case is well-finished, and the 38mm size is considered comfortable and well-weighted despite being smaller than modern watches. Accuracy figures range from +2 seconds/day to +8 seconds/day, and some owners compare Fortis quality favorably to Omega. However, some users find the MSRP too high compared to brands like Sinn and Damasko, and one owner reported internal parts dislodging from a limited edition model. Concerns have also been raised about stripped lug screws on B-42 models and potential parts shortages due to past bankruptcy protection filings. Overall, owners rate the Fortis Original highly for its durable construction and tool-watch functionality at a competitive price point.

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