2008 Ap2 serial numbers

Hello, I have a set of 2008 ap2, only one club has a serial number stamped on them, is that common?

Chris, 

We put our serial # on just the 6 iron for stock sets.  If the set was ordered custom (ie 1* upright), then every iron would have a serial # on the hosel.

Cameron

1-888-TITLEIST 

Thank You