Cartier Rotonde de Cartier Grande Complication Skeleton Watch - 43.5 mm Platinum Case - W1580017 Air lacquered blue dial with 18K

lacquered blue dial with 18K white gold applied hour-markers and hands

nine sided crown set with a sapphire

BRAND Audemars Piguet SERIES Royal Oak MODEL NUMBER 26240ST

BRAND Audemars Piguet SERIES Royal Oak Concept MODEL NUMBER 26577IO

Brand Audemars Piguet Model Number 26560IO

Cartier Rotonde de Cartier Grande Complication Skeleton Watch - 43.5 mm Platinum Case - W1580017 Air lacquered blue dial with 18K43. 5mm platinum case, 16. 25mm thick, sapphire back, beaded crown set with a cabochon, sapphire crystal, silvered opaline dial with snailed gold counters, gold flange with sunray effect and black transferred Arabic numerals, blued steel apple shaped hour and minute hands, hammer shaped hands in the small counters, calibre 9436 MC manual winding movement with tourbillon perpetual calendar, single push piece chronograph and skeletonized movement