IWC Portofino Automatic Day & Night Le Petit Prince 34mm 37mm a screw down caseback a screw down caseback The Tirisi Venice ring TR9807D(2P) blends elegant simplicity with striking details The dial is adorned with twelve diamond cut hour markers and a day night indicator at 6 o'clock The taupe calfskin strap with a butterfly clasp and the quick change system ensure comfort and versatility