Bulova watch for men, this watch is part of the Marine Star collection. This watch carries a 3-year warranty, applicable to the movement only. Powered by the wearer's own movement, this self-winding mechanical watch never needs a battery. This timepiece runs on a 21-jewel movement. Ruby is the second-hardest stone after diamond, which is why it is the chosen stone at the heart of the mechanism. The synthetic rubies used in an automatic watch have exactly the same chemical properties as genuine ruby. This watch features the following: - Japanese automatic movement - Water resistance up to 200 m - HMS (Hour Minute Second) - Roman numeral markers - Silicone strap