Franck Muller unveils piano-inspired watch with 170-hour power reserve and 20-layer black dial
Franck Muller's limited-edition Grand Curvex Piano 7 Days Power Reserve has launched in Japan with a 170-hour hand-wound Calibre 1700 and a 20-layer piano-black dial. References CX36S6PRFOPIANOJ ACNR3N and CX36S6PRFOPIANOJ 3NACNR start at ¥4,818,000, following an early Ginza Six launch on 6…