cal. 2891 manual winding nickel lever movement 57 jewels repeating mechanism on 3 steel polished gongs • silvered dial with guilloché motifs to the centre applied Roman numerals eccentric fan-form aperture for power reserve and dynamograph indication subsidiary seconds • brushed and polished 18k white gold case repeating pusher and petite & grand sonnerie selection to the band sapphire crystal case back display secured by 5 screws • with an 18k white gold Audemars Piguet folding clasp