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Six green Wilson and Penn tennis balls, each signed in black felt tip by Riggs; Riggs’s personal ATT calling card; and a TLS from Riggs’s mother, signed in pencil, “Riggs,” in front of the typed word, “Mother,” one page, both sides, 8.25 x 10.75, December 15, 1958. Mother Riggs writes to Bobby and Priscilla before the holidays with an update on her physical state after suffering a fall. In overall fine condition, with intersecting folds to letter. RR Auction COA.