You've heard of a Letter of Authentication, but how 'bout a Video of Authentication?!
Offered here is Phil Mickelson's actual custom Scotty Cameron putter used during his 21st PGA Tour victory at the 2002 Canon Greater Hartford Open.
But don't take out word for it. Phil Mickelson has graciously put together this video authenticating this putter (and another putter not up for auction).
In addition to the Video of Authenticity, which is a first for us here at Golden Age, we have also "Photo Matched" this putter. The act of photo matching game-used memorabilia is all the rage in the collecting industry right now, so we have located loads of photos of Phil Mickelson using this exact putter during that 2002 GHO victory, as well as in the Open Championship, PGA Championship, and Ryder Cup.
This custom putter is a left handed red dot Circle T Scotty Cameron. It has a teryllium face that Scotty Cameron himself personally inserted into this putter. The toe is hand-stamped "PHIL."