Franck Muller unveils piano-inspired watch with 170-hour power reserve and 20-layer black dial

A grand piano might seem an unlikely starting point for a wristwatch, but Franck Muller has taken inspiration from the instrument's polished exterior and precisely controlled mechanics. Its new Grand Curvex Piano 7 Days Power Reserve combines a glossy black dial with an in-house movement capable of running for approximately 170 hours on a full winding.

The watch launched at Ginza Six in Tokyo on 6 November 2026, ahead of its wider Japanese release on 12 November.

A piano-black dial with seven days of power

The dial gets its mirror-like finish from 20 layers of black enamel, echoing the polished surface of a concert grand piano. Conventional hour numerals have been removed, leaving the hands, branding and a power-reserve indicator at 10 o'clock. The latter uses a pointer rather than the disc-style display found on earlier versions.

Inside sits Franck Muller's manually wound Calibre 1700. The movement is designed to release stored energy gradually and operates at a low beat rate, with a stated power reserve of approximately seven days. Unlike an automatic watch, it needs to be wound by hand, although not every day.

The three-dimensionally curved case measures 53.1 × 36 mm and is paired with a calfskin and rubber strap.

The stainless steel and 18K yellow-gold model costs ¥4,818,000 and is limited to 50 pieces. The 18K yellow-gold and stainless steel version is priced at ¥5,830,000, with just 20 pieces available.

It may not play a note, but this particular piano can keep time for an entire week.