I recently purchased a 910 D3 10.5* head that was reportedly from a Titleist Fitting Cart. When I received the head I noticed there was no serial number on the heel of the club.

Basically I am wondering if the Fitting Cart heads came without serial numbers or could this possibly be counterfeit. A magnet doesn't stick to the club and the markings are identical to my 8.5* head that I know is legit.

Please help!