Hi Bart - 

Titleist did not release an AP2 2iron.  There is a 2 iron available in the CB only.  

Hi Joe - 

It is certainly possible for a set of irons to be stamped with different serial numbers.  The serial number is generated at the time the order is entered.  So if the 4iron and GW in your set were ordered at a different time they would be stamped…

Hi Mike,

Thanks for the question. At this time there are no plans to release new versions of the AP1 or AP2 irons in 2011.  As always, we will come to our Team Titleist members first with updates on any new products that may be coming out in the near future…