No idea.

What is it with the St. Dupont lighters?

http://www.cigarsmokers.com/threads/13034-ST-Dupont-Real-or-fake

http://www.cigarsmokers.com/threads/14421-Need-some-expert-opinion

http://www.cigarsmokers.com/threads/10396-Anyone-know-what-lighter-this-is

Someone should go through and find all the St. Dupont real/fake threads and tag them so we can find them faster for the next guy who asks this question.