Lynn Downey works as a historian for Levi Strauss & Co. in San Francisco and is responsible for Levi's extensive archives of clothing, photographs, posters and artifacts. The jewel in this amazing archive is the world's oldest pair of Levi's- a pair "XX," one-pocket jeans, which date back to 1879 and are valued at $125,000. Unfortunately the archive is not open to members of the public, however there is a permanent display of choice pieces from the collection in the lobby of the Levi's Heaquarters in San Francisco.