IWC - Portuguese Tourbillon Mystere Retrograde Watch IW504602

44.2 mm 18K red gold case, 15.3 mm thick, sapphire back, sapphire crystal with arched edge, antireflective coating on both sides, ardoise dial, caliber 51900 pellaton automatic winding movement with power reserve display, retrograde date display, flying minute tourbillon, approximately 7-day of power reserve, dark brown alligator leather strap by Santoni. Water resistant to 3 bar.