Which is bigger, the Fortis Flieger F-43 Bicompax or the Redux Zero-Hour?

The Fortis Flieger F-43 Bicompax wears larger at 43mm versus 39mm for the Redux Zero-Hour — a 4mm difference across the dial.

Which has a longer power reserve, the Fortis Flieger F-43 Bicompax or the Redux Zero-Hour?

The Fortis Flieger F-43 Bicompax carries a 58-hour power reserve against 41 hours on the Redux Zero-Hour.

What movement does the Fortis Flieger F-43 Bicompax run compared to the Redux Zero-Hour?

Both watches run automatic movements — the Fortis Flieger F-43 Bicompax uses the Sellita SW510 BH a and the Redux Zero-Hour uses the Seiko NH35.

Side by side

Fortis Flieger F-43 BicompaxvsRedux Zero-Hour

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

Fortis Flieger F-43 Bicompax

F-43 Bicompax

MSRP $4,180

Redux Zero-Hour

the-courg-watch-zero-hour-39mm

At a glance

11 of 29 specs differ

Diameter

Flieger F-43 Bicompax43mm

Zero-Hour39mm

Power Reserve

Flieger F-43 Bicompax58h

Zero-Hour41h

Water Resistance

Flieger F-43 Bicompax200m

Zero-Hour200m

MSRP

Flieger F-43 Bicompax$4,180

Zero-Hour—

Full specifications

Case

6 specs

Crystal & Dial

1 specs

Dial Color

Original

Black

Movement

3 specs

Caliber

Sellita SW510 BH a

Seiko NH35

Power Reserve

58h

41h

Jewels

Pricing

1 specs

MSRP

$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.

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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Redux Zero-Hour

Owners widely praise the Redux Courg Type 39MM for its robust, no-nonsense design and good overall quality, with a reliable Seiko NH53A movement keeping time well. The titanium case and crystal have shown scratch resistance, and the bezel action is described as tight by some. Reviewers note the proprietary RDXB1 or blue lume glows brilliantly, though briefly. Some owners flag the crown stem as flimsy and the unidirectional bezel as having some play. Overall, owners rate the Redux Courg Type 39MM highly for its functional tool-watch design and durable titanium construction.

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