VIENNA – The world's largest gold coin has been sold at auction in Austria for euro3.27 million .The coin — a 2007 maple leaf coin with a face value of 1 million Canadian dollars ($960,000) that weighs 220 pounds (100 kilograms) and has a diameter of 21 inches (53 centimeters) — went under the hammer Friday at Austria's prestigious Dorotheum auction house.It was pocketed by Span