IWC Schaffhausen Portofino Hand-Wound Tourbillon Rétrograde

The IWC Portofino Hand-Wound Tourbillon Rétrograde, reference IW516501, has a 45 mm case in 18-carat 5N gold. The watch has a flying minute tourbillon; the case has a thickness of 14 mm. Calibre 59900 is manual-winding and has a 192-hour power reserve and 38 jewels. The silver dial has a date display and a power reserve indicator beneath arched-edge sapphire glass. A dark brown alligator leather strap by Santoni is on the watch. A water-resistance rating of 30 metres applies to the case. The movement is visible through a see-through case back.