Treasure Detectives: Is this John Lennon's Mug?

12:00 AM ET Tue, 5 March 2013

A well-known person or historic event can be associated with an ordinary item adding incredible value. But how do you know if the story is true? Forgeries expert Curtis Dowling, from CNBC's "Treasure Detectives," explains why it's important to authenticate the seller as well as the item.