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Visby, SWEDEN: A handful of Arabic 10th century silver coins found by brothers Arvid and Edvin Sandborg on the Swedish island of Gotland is shown 30 October, 2006. The 1,100 coins, along with several silver bracelets, formed a three-kilo viking treasure trove that the brothers found buried on a neighbor's property last week. AFP PHOTO / SCANPIX SWEDEN / Tobias Wallstrom (Photo credit should read TOBIAS WALLSTROM/AFP/Getty Images)

Visby, SWEDEN:  A handful of Arabic 10th century silver coins found by brothers Arvid and Edvin Sandborg on the Swedish island of Gotland is shown 30 October, 2006. The 1,100 coins, along with several silver bracelets, formed a three-kilo viking treasure trove that the brothers found buried on a neighbor's property last week. AFP PHOTO / SCANPIX SWEDEN / Tobias Wallstrom  (Photo credit should read TOBIAS WALLSTROM/AFP/Getty Images)