The clubs built on our PGA Tour van, Loker Tour dept or our O'side facility for Tour players do not have serial numbers so we cannot track those for authenticity. 

Unless it is a prototype, we use the same heads for the Tour as we do here at our manufacturing facility.  We do our club validation on the Tour first, then we bring that club to production.  We don't use separate "Tour Issue Heads".

It's so great to know that we are playing the same equipment that the best in the world are playing - kudos to Titleist!

I am currently playing Hogan blades but hoping to make the switch to a new set of Titleist irons soon.