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Official Appraisers & Authenticators for the Naismith Memorial Basketball Hall of Fame. The industry's premier consignment-based auction house for authentic sports memorabilia & important historical autographs. Proud marketing partners and supporters of the MLBPA, NFL Alumni, NBA Retired Players Association and the Babe Ruth Birthplace and Sports Legends Museum. Founded in 1989, Grey Flannel Auctions Inc. quickly earned a stellar reputation as the leader in game-used/game-worn jerseys and equipment, sports & historical autographs, championship jewelry, trophies, awards, pre-1960s baseball cards, entertainment, rock n’ roll, political, americana and historical memorabilia. Now offering free expert appraisals.