i'm no expert either and my first impression is no and that it looks slowly drawn....however here is one that looks VERY similar. Most of his sigs are more rushed and this one is definately not. Just my 2 cents and am not saying yours is authentic but thought I would bring this one to your attention. I'll let the experts chime in.
http://millcreeksports.com/images/19...0d91b006e5.jpg
Brandon