Possibly unique Swiss 18k gold complicated watch Circa 1985

Gold and gem set lever with triple calendar and moon phases by IWC
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A very fine and possibly unique Swiss 18 carat gold and gem set hunting cased keyless lever watch with triple calendar and moon phases, circa 1985. Highly engraved gilt finished lever movement, 31 jewels, glazed dust cover. White dial with Roman numerals, three subsidiary dials indicating date, day and month in German combined with seconds, aperture for moon phases combined with the lunar calendar. Heavy case, the cover with applied diamond, emerald, ruby and sapphire set Royal Khanjar, the coat-of-arms for the Sultanate of Oman, to the inside of the case a map of the Middle East centered on the GCC countries and Bismillah Al-Rahman Al Rahim and GCC Summit in Arabic, the back cover with applied pavé set diamond map of Oman with two rubies indicating the cities Muscat and Salalah. Comes with 18 carat gold IWC chain and diamond set fob. Case, dial and movement signed, case numbered.
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Diameter: 60 mm
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Signed: International Watch Co Schaffhausen Swiss