achieved by David Feldman have been for the Swedish Treskilling Yellow ($2.2 million in 1996), for which his photo appeared in the Guinness Book of World Records, the Mauritius Two Pence Blue ($1.4 million in 1993) stamps and the $1,000,000 for the Alexandria "Blue Boy" Postmaster's Provisional in 1981. In 1987 Feldman joined together with ex-Christie's President, Géza von Habsburg and others to form Habsburg Feldman SA. Headquartered in Geneva, Switzerland, it held major auctions in paintings, watches, jewellery, art-deco, art nouveau and objets d'arts in centres all over the world. Ranked as the world's third biggest auctioneer [by volume of sales], the company established world records selling a Patek Philippe watch "Le Calibre" at 5 million Swiss francs and "La Rhubarbe", a piece of Galle glass at 1.5 million Swiss francs in 1988. Feldman also established a new record for a painting by Marc Chagall at US$4.62 million in the same year. In 1990 Feldman left the company over differing views with his associates regarding business strategies. In 1997, David Feldman was invited to sign the Irish Roll of Distinguished Philatelists for his support and contributions to Irish philately. Feldman auctioned off one of his personal collections in May 2003: The 'Emerald' Collection of Destination Mail of the World contained mail to and from Ireland dating from 1714 to 1913 accumulated over about forty years. In 2008 Feldman merged his company with Feldman Frey Philatelic Group, led by , a Zurich lawyer and banker. By 2012 Feldman had relinquished all his financial interest in the company to the Frey Group and to current management, and became Honorary chairman. The Isleworth Mona Lisa In 2004 Feldman was mandated by Elizabeth Meyer to make research, scientific and physical examinations of her painting which had been known as the Isleworth Mona Lisa. In 2010, he formed, together with Markus Frey and Daniel Kohler, The Mona Lisa Foundation, a non-profit organisation, which absorbed decades of previous research concerning that painting, and initiated new expertises, scientific tests and physical examinations. The work culminated in the publication of 'Mona Lisa – Leonardo's Earlier Version', a 320-page volume published in 2012. The exact status of the painting, however, continues to be debated by art historians. Family David Feldman married Fabienne Marquart of Switzerland in 1974, now separated. They have 6 children, four boys followed by two girls (adopted Thai sisters) Amiel David (b. 1979), Joel (b.