This official 2000 US Open flag has been autographed by the great Jack Nicklaus. Jack famously said goodbye at the 2000 US Open, which was held at Pebble Beach, and the site of Tiger Woods' historic victory 2 days later. This flag comes from Jack Nicklaus' own company, and contains his Golden Bear hologram attesting to its authenticity.
Jack Nicklaus Golden Bear Hologram of Authenticity
Letter of Authenticity from James Spence Authentication (JSA)