Clockwise from top left: Master Calendar by Jaeger-LeCoultre; Tonda 1950 Squelette by Parmigiani; Bulgari Bulgari chronograph by Bulgari; Portugieser Perpetual Calendar by IWC Schaffhausen; Altiplano Chronograph by Piaget; MasterGraff Ultra Flat Icon Skeleton Tourbillon by Graff; J12-365 by Chanel; CT60 Calendar by Tiffany & Co