Bold signature, “Best wishes/Pancho Gonzalez,” in black fountain pen on a 6×4 white index card.  A tiny bend at the top right corner tip; otherwise very fine condition.  Undated on the reverse side, but likely early 1960s.  John Verzi collection.  Gonzalez was the dominant tennis pro of the 1950s, winning twelve Pro Slam and two Grand Slam titles during his career.