I was looking for a 913F 17* fairway wood. Titleist says that they don't have any more 17* heads in stock so I started to look online to e-bay, Amazon and some other sites. One site had a club that was in pretty good shape but I noticed that the club did not have the 17* stamped on the sole. It had to be a knock-off. Now I'm a little leery of doing this. How do you really know what you're getting? Titleist, can you help me out with this?