AMSTERDAM.- Over the course of nine days in November, PAN Amsterdam, the Netherlands’ art and antiques fair, presents more than 10,000 objets d’art. The common denominator is that all the objects are vetted for authenticity, artistic quality and condition and are on sale at prices from € 500 to € 500,000. The 130 or so exhibitors represent the elite of the Dutch and Flemish art trade. The works of art at PAN Amsterdam span more than 5,000 years of history. They include an antique faience New Year’s flask and an 18th-century secretaire attributed to Abraham Roentgen, one of the most famous furniture makers of his age. From more recent times there is a rare tubular steel chair, Gerrit Rietveld’s Beugelstoel from around 1927, in its original natural wood finish, a 1930 necklace by the renowned Parisian workshop Fossin & Fils and a large display of works by Zero artists. Never before has so much