check your 5 or 6 iron....I believe its on only on one club....not each!

Mine have them on all the clubs.... Mine were a special order but I'd be concerned if they weren't purchased at an authorized dealer... Support your local course/shops and you won't questions if its authentic product....

KB: If you cannot find the serial number, my question to you would be; did you purchase these clubs from an authorized Titleist dealer? I think I would question the individual/store I purchased these from.

1. If the set was purchased off the rack then serial number would be on the six iron.

2. If they were a custom ordered then the number would be on the hosel of every club.

Just bought a set for my son, 6-pw, all have serial #'s.

If you custom order then they put the same number on all the clubs you ordern not just the irons. I bought a set of C16's about a year ago, together with a new Vokey wedge, driver and fariway wood. All of them have the same number on the hosel.