Pierre Kunz Spirit of Challenge Retrograde 41mm 18K White Gold and Diamond Automatic Watch W/Leather Strap and Papers (Ref. PKA 011 SDR.3) - This exquisite timepiece from Pierre Kunz has a marvelous design that features aesthetic appeal and technical innovation. This Spirit of Challenge Retrograde watch features a 41mm coin-edge case in 18k white gold with a bezel and lugs lined with diamonds. Protected by a sapphire crystal is a tastefully executed silver and black dial with Roman numeral hour markers plus retrograde second and date sub-dials. Beating inside is the PK2001 011 automatic movement offering 42 hours of power reserve. The open case back is signed with PKA 011 SDR.3 along with the number and the text "Spirit of Challenge." This timepiece is fitted with a black leather strap with an 18K white gold tang buckle embellished with diamonds. The watch includes the manufacturer's papers.