Fortis Watch Aviatis Aeromaster Steel 655.10.10 L.08. Hard as steel, robust, and yet elegant. Those are the core properties that stand not just for the 655.10.10 Aeromaster Steel, but for the entire Fortis portfolio. The Aeromaster series has long held firm its place in the Aviatis Collection. Mostly worn on a brown leather wristband, this pilots watch perfectly embraces your wrist. As the name suggests, the Fortis Aeromaster Steel is a master of the air. The properties that such a pilots watch has to have are all united in this single timepiece, perfect readability, robustness, and wear comfort.