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Ultimate accuracy powered by BALL in-hous movement. Extreme toughness shaped by extraordinary bronze. The Engineer M Star Magna showcases exceptional watchmaking prowess. The automatic BALL Manufacture Caliber RRM7309-C delivers certified COSC precision with a robust 80-hour power reserve. And its housed inside an ultra-tough aluminum bronze alloy case that offers incredible impact strength and superior corrosion resistance in all environments.As a leader in luminosity, BALL has equipped the Engineer M Star Magna with micro gas tubes for quick and clear reading in darkness. While this models stands out because of its caliber, the black, blue and green dials are eye-catching due to their expansive design.Often favored for nautical exploration, the aluminum bronze alloy is perfect for any environment that demands high corrosion resistance. The bronze case withstands the corrosive elements brought by wind, water and unpredictable weather. And because bronze ages based on the wearers experiences, every timepiece will have a unique story to tell. Going further and deeper the timepiece is water resistant to 100 meters, enabling unfettered underwater exploration.