Beckett magazine just did an article on the evolution of Harper's sig. I believe the BH is the more recent incarnation. A lot of it has to do, too, with how many cards he had to sign. I think when he signed fewer cards, he signed his full-ish name.
Always looking for Verlander, Cabrera, Maybin, Mike Stanton (marlins), and Avisail Garcia.
*TRYING TO COMPLETE MY VERLANDER ROOKIE COLLECTION. 44/47. ONLY 3 TO GO!*