The use of 925 silver is a first for a TUDOR divers' watch, and the composition of the chosen alloy is a closely guarded secret. Entirely satin-finished for a matt effect, it possesses an unexpected incandescent brilliance, which can best be admired on the wrist. 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.