IWC - Portuguese Tourbillon Mystere Retrograde Watch IW504402

44.2 mm 18K red gold case, sapphire-glass back, silver-plated 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, brown alligator leather strap. Water resistant to 3 bar.