DE BETHUNE, DB25L Milky Way Spherical moon-phase indicator with precision of one lunar day every 122 years. Power reserve: 6 days, ensured by a self-regulating twin barrel A. De Bethune Innovation (2004). Case: Platinum set with 66 baguette-cut diamonds. Back: Open back in polished white gold and sapphire crystal (hardness of 1800 Vickers) with double anti-reflective coating. Strap Extra-supple alligator skin with alligator padding. Buckle and ardillon in platinum