When creating the IWC-manufactured 94200 calibre, the watch designers developed a new solution for the technically sophisticated digital display (patent pending). While toothed cogs moved the discs in the historic Pallweber pocket watches, the impulse that advances the single-minute disc is now supplied by a separate wheel train with a barrel of its own. A release mechanism that establishes a connection to the watch’s main wheel train unlocks the train every 60 seconds and then immediately locks it again. After 10 minutes, the single-minute disc moves the 10-minute disc forward by one position. Every 60th minute, the hour ring jumps to the next numeral. The fact that the flow of power in the main wheel train is uninfluenced by the separate wheel train in the display discs guarantees a precise rate and a high 60-hour power reserve.
Just like on the historic Pallweber pocket watches, the display discs are connected by a mechanical linkage with a star wheel (Maltese cross drive) and can be easily moved forwards or backwards using the crown.