I have a person offering me a set of AP2 irons with Fugikura R Graphite shafts.  I looked at the clubs and only the 3 and 7 have been hit but I did not see a serial number.

My woods are all Titleist and have serial numbers.  Where would I locate the serial number on the irons?  I do not know where they were purchased but I have emailed and asked for the original purchase place and am still waiting for a reply.

I have seen comments that a serial is on the 6 iron or all irons or no serial if tour. 

I appreciate your response.