A look at some world's most expensive antiques

A silver openface keyless lever chronograph watch (L) and an oversized silver hour angle aviator's wristwatch with indirect sweep centre seconds are pictured during an auction preview at Christie's in Geneva April 1, 2011. The items signed Longines, formerly the property of Air Marshal Italo Balbo and received probably from Col. Charles Lindberg for the wristwatch, carry a price estimate between US$ 30,000 and 50,000.