Titleist, 

I bought a used set of Titleist AP2 710 irons a while back. I hit my old irons a few days ago and noticed the swingweights were substantially different than my AP2 set. So, I decided to check the swingweights and found that my AP2 set is at D7 which is quite a bit heavier than that the stock D2. 

I was wondering if by the serial number that you would be able to check to see if a custom order was made for these irons were for a higher swingweight  or if you have any information on this set. The serial number is 19SZX.

Thank you, 

Ben