The Ball Caliber 7309 watch comes with an 80-hour power reserve, a chronometer certification from the COSC, and a 28,800-vph frequency. The caseback of the brand’s new Engineer M Challenger features a sapphire window for showcasing the movement. The company says that this timepiece won’t be its last in their ball watch Singapore price list to have an in-house movement. Thus, the Caliber 7309 will serve as a base to add further complications.
But, currently, the Challenger is the brands’ first and only timepiece outfitted with the proprietary movement. Its stainless steel case has a diameter of 40mm or 43mm. It is resistant to water to 100 metres.