Jordan Spieth's autograph habits have been under extreme scrutiny this year, and we've even been quoted on the Golf Channel and elsewhere about the sloppy, illegible autographs that he gives to anyone that he perceives to be a professional autograph chaser. And even when his signature is legible, he often signs an abbreviated 
"J.Spieth."

Because of this, Spieth's early full-signature autographs (especially on 2015 Masters flags) are coveted by collectors. Prime examples routinely fetch upwards of $1,000. And if Jordan's signing habits continue, there is no telling what these full signature 2015 Masters flag will sell for in the future. 

Certificate of Authenticity from Green Jacket Auctions (GJA)