IWC Portugieser Tourbillon Mystere Retrograde Watch - 44.2 mm Red Gold Case - Ardoise Dial - Dark Brown Alligator Strap - IW504602 8999 has a Rose Gold 31

has a Rose Gold 31 mm Case with Screw Down Crown and a Rose Gold

43 mm polished and satin finished steel case

and an unparalleled design

caliber 1847 MC self-winding mechanical movement

blue sailcloth strap with gold bar tack loop stitches

IWC Portugieser Tourbillon Mystere Retrograde Watch - 44.2 mm Red Gold Case - Ardoise Dial - Dark Brown Alligator Strap - IW504602 8999 has a Rose Gold 3144. 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.