The Fortis Flieger F-43 Bicompax F4240004 has a case made of stainless steel, which is completed with a steel tension. Fine adjustment of the bracelet length is made possible by a micro adjustable clasp. The Swiss mechanical movement Fortis UW-51 (its base is Sellita SW510) with automatic winding works reliably in the case. It runs at a frequency of 28,800 semi-frequencies per hour and has 27 jewels. The machine also has a "hacking" function (stopping the second hand when ordered) and the possibility of manual crown winding. There is a stopwatch function with a 30-minute counter at the 3 o'clock position. At the 6 o'clock position we find a handy date display. The bi-directional GMT lunette allows the reading of the time in the second time zone.

The perfectly clear dial is protected by a sapphire crystal that is maximally scratch-resistant. The double-sided anti-reflective coating ensures excellent legibility even in direct sunlight. The SuperLuminova luminescence on the hands and indexes enables readability in darkness and low-light conditions. The water resistance of this model is 200m, so it can handle even greater contact with water, such as swimming or diving to about 20m. The water resistance is supported by a screw-down crown.