Tourbillon Musical Watch

The 5207 Grand Complication features the base movement from the firm’s 3939 minute repeater/tourbillon, but the perpetual-calendar module is a completely new development that makes two improvements...
Although it carries a tourbillon escapement and perpetual calendar, the real attraction of the 2755 is the new minute-repeater mechanism with silent regulator. Finally, Vacheron Constantin's movement...