1979 Tom Watson Signed Sports Illustrated PSA/DNA This magazine was singed in person and is authenticated by PSA/DNA. Don't be fooled by the many fake autographs on Ebay. This autograph is guaranteed authentic and has been certified by PSA/DNA, the authority on autograph authentication. They are used by practically every major auction house in the country along with being recognized by eBay as a certified authenticator. PSA Cert# f88331
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