Inspired by Baume & Mercier models from the 1950s and conceived as a continuation of their Classima line, the versatile and understated Clifton model has remained one of our favourites B&M’S ever since it debuted in 2013. And, though it already plays host to an incredibly wide variety of complications, it gets another this year in the form of the 12,000 USD Clifton Manual 1830 Twinspir. This state-of-the-art movement centres around a totally original and proprietary silicon hairspring, developed by the Richemont Research & Innovation team. First a little background though. A hairspring, or balance spring, is a spring attached to the balance wheel in mechanical timepieces. It causes the balance wheel to oscillate with a resonant frequency, which controls the speed at which the wheels of the timepiece turn, and thus the rate of movement of the hands. In vintage watches, the hairspring was often made of steel wire but more recently it has been made from a variety of different alloys, the most common being Nivarox. The new Clifton Twinspir’s spring goes its own way however with a new silicone composite material that allows it to not just be immune to temperature fluctuations, but corrosion and magnetism too. The net result is a more even and stable chronometric performance, with far greater long-term accuracy. Capable of running for 90 hours, the 18-karat red gold Clifton Manual 1830 watch is 42mm wide and 8.9mm thin, with a water-resistance rating of 50 metres.