Side by side

Fortis Flieger F-43 BicompaxvsLongines LONGINES SPIRIT FLYBACK PROTOTYPE

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Flieger F-43 Bicompax
FortisFlieger F-43 Bicompax
MSRP $4,180
LONGINES SPIRIT FLYBACK PROTOTYPE
LonginesLONGINES SPIRIT FLYBACK PROTOTYPE
MSRP $7,400

At a glance

9 of 29 specs differ
Diameter
Flieger F-43 Bicompax43mm
LONGINES SPIRIT FLYBACK PROTOTYPE42mm
Power Reserve
Flieger F-43 Bicompax58h
LONGINES SPIRIT FLYBACK PROTOTYPE40h
Water Resistance
Flieger F-43 Bicompax200m
LONGINES SPIRIT FLYBACK PROTOTYPE100m
MSRP
Flieger F-43 Bicompax$4,180
LONGINES SPIRIT FLYBACK PROTOTYPE$7,400

Full specifications

Case

4 specs
Diameter
43mm
42mm
Thickness
14.5mm
17mm
Lug-to-Lug
49.5mm
Water Resistance
200m
100m

Crystal & Dial

1 specs
Dial Color
Original
Green

Movement

3 specs
Caliber
Sellita SW510 BH a
L791.4
Power Reserve
58h
40h
Jewels
27
25

Pricing

1 specs
MSRP
$4,180
$7,400

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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.

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.

LONGINES SPIRIT FLYBACK PROTOTYPE

Owners widely praise the Longines Spirit Flyback Prototype for its attractive finishing, COSC-certified movement, and value as a flyback chronograph. Reviewers highlight its refined 39.5mm case and simplified dial, while some owners appreciate the reduced thickness and improved wearability compared to larger variants, with a lug-to-lug distance noted as potentially long for smaller wrists. The watch features a 68-hour power reserve and a bespoke L791.4 movement. However, the case thickness is a consistent point of discussion, with multiple sources citing 17mm, though some reviewers suggest thoughtful design makes it wear closer to 13.5-14mm. Owners are split on the dial's aesthetic, with some preferring previous configurations with gold subdial rings and concentric textures over the current flat matte dial and cut-off numbers. The leather strap is also noted as stiff and pinching.

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