Entirely developed and manufactured in-house, calibre 7135 operates at an exceptional 5 hertz, or 36,000 beats per hour, an unprecedented frequency for Rolex. This enables it to measure time to one tenth of a second. It also presents a particularly attractive design. Through the watch’s transparent case back, the sparkle of the cut-out oscillating weight in yellow gold may be admired, as well as the delicate Rolex Côtes de Genève decoration on the bridges.