Rare Automatic Heuer Siffert Autavia reference 1163. Very nice original condition, untouched and immaculate dial, 100% original. Very clean case only lightly polished, … Original Heuer Micro-Rotor Caliber 12 running smoothly and all Chrono functions spot on. Beautiful original bezel and original black insert showing minimal to no wear. Equipped with its original Heuer Mesh Band (dated 1971), full size, little to no stretch.