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 Jordan 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 full-signature autographs are coveted by collectors. Prime examples routinely fetch in excess of $1,000. And if Jordan's signing habits continue, there is no telling what these full signature flags will sell for in the future. 

This is an official embroidered 2015 US Open flag that contains a full signature Jordan Spieth autograph.

Certificate of Authenticity from Beckett Authenticated