IWC - Portuguese Tourbillon Mystere Retrograde Watch IW504401

44.2 mm platinum case, sapphire-glass back, ruthenium-black dial, pellaton automatic winding calibre 51900 movement with power reserve display, retrograde date display, flying minute tourbillon, Glucydur beryllium alloy balance with high-precision adjustment cam on balance arms, Breguet spring, rotor with 18-carat gold medallion, approximately 7 days of power reserve, black alligator leather strap. Water resistant to 3 bar.