The Franck Muller Cintree Curvex Chronograph Perpetual Calendar Bi-Retro boasts a complex automatic chronograph movement with bi-retrograde functions. This intricate movement allows for the day, date, and month displays to jump back instantaneously when reaching the end of their cycles. The 36mm x 42mm tonneau-shaped case, characteristic of the Cintree Curvex line, is crafted from either 18k white or rose gold. The dial features multiple subdials for chronograph and calendar functions, offering a comprehensive display of timekeeping complications.