The Fortis B-42 Flieger Day-Date (Reference 655.10.158) is a 42mm Swiss-made pilot's watch known for its high legibility and rugged "tool watch" construction. It features a distinctive layout with the day window at 9 o'clock and the date at 3 o'clock, powered by the reliable ETA 2836-2 automatic movement.

• Case: 42mm brushed stainless steel with a thickness of approximately 12.2mm to 12.5mm.

• Movement: Swiss ETA 2836-2 automatic caliber, featuring 25 jewels, a 28,800 vph frequency, and an Incabloc shock absorber.

• Water Resistance: Rated for 200M (20 ATM), suitable for swimming and light diving, though it typically uses a push-pull crown rather than a screw-down one.

• Crystal: Scratch-resistant sapphire crystal, often featuring high-quality anti-reflective (AR) coating on both sides for superior clarity.

• Dial: Matte black with large Arabic numerals and sword-style hands, all coated in Superluminova for excellent night-time visibility.