Entirely satin-finished for a matt effect, the lustre of the Black Bay Fifty-Eight 18K is emphasised by the elegant combination of dial and bezel, which are a rich “golden green” in tone with matt gold details. Its open case back reveals the new Manufacture Calibre MT5400, which allows the watch to be "weekend-proof", allowing it to run for 70 hours smoothly and reliably. This is due to the movement structure that has been designed to ensure robustness, longevity and reliability.