Seamaster 150m Aqua Terra Observatory 41mm: 1. Market exclusive natural rubber strap available for free selection. 2. Made of stainless steel, the horizontal teak dial showcases uniqueness. 3. Screw-in embossed crown with a brand new conical design for easier adjustment. 4. Exquisite brushed finish on the sides, with a new wave design on the case back. 5. Equipped with the black balance wheel 2824 modified 8900 movement, offering bi-directional energy storage, precise and reliable! 6. Top and bottom sapphire glass with anti-reflective coating, capable of anything from land to sea!