where did you buy it?

The only thing I can think of where the driver will still be authentic is that the grip was saved, the club cut down, and the grip re-installed. Measure it first to see if it is standard length for a 910. I'd still recommend calling Titleist's customer service number and verifying the serial number on the head, whether you bought the club new or pre-owned. Best of luck.

Sounds like it has been shortened and regripped. --Jerry

jose i

I want to know if my driver is real it has the authentication sticker half way under the grip. And the grip is kinda bumpy.

 

I've had people bring in their Titleist clubs to get worked on, say, to have their club(s) shortened. If I take off a 1/2"-1", and install the grip, sometimes the grip will slide over and cover up the authentication sticker a little. I'm not too sure about the grip being bumpy though. 

 

Just make sure that you purchase all of your Titleist equipment through an authorized Titleist rep to guarantee you authentic Titleist gear.

It's 43 inches from the end of the hosel to the end of the grip