As I understand it, There are no serial numbers listed on Scotty Cameron Kombi S Putters .... the number on the shaft I was told relates to something else.  

However, if you find yourself wanted to know if your putter is authentic you can send it to the Scotty Cameron Custom Shop and they will validate the club and give you a certificate of authenticity for $65.  This is always done for tour putters.

Hope that helps!

thank you jerry and chris, im starting to wonder, since im a lefty, if sc custom shop would turn my kombi s from 33 in. to a belly putter and how much that would cost, if they would do it. where is a titleist rep when you need it. come on cathi help me out here with a answer.