I'm not sure. But I am interested to find out as well. I wouldn't risk purchasing them, unless you are able to confirm the serial numbers with someone at Titleist.

Hi guys,

The only way to ensure you are buying authentic Titleist equipment is to purchase from an authorized Titleist retailer. Here is a link to a thread with some information on what we do to protect our brand from counterfeiters along with some tips on how to spot counterfeit items: http://www.titleist.com/teamtitleist/team-titleist/f/6/t/3316.aspx

As for the 910 driver heads, we do not sell those individually and sorry to repeat this but the best way to ensure you are buying authentic Titleist equipment is to purchase from one of our authorized retailers. Here is a link to our golf shop locator:

http://www.titleist.com/locator.aspx

Even for the reputable sellers on Ebay, where would the heads only come from and are all the adaptors aftermarket that are on ebay since you do not sell them

Lionel