1977-79 Sportscaster Wayne Gretzky RC #77-10 PSA NM/MT 8. A rare item up for auction, this Gretzky pre-dates his NHL rookie and is considered one of his most desirable cards. These are tough! This PSA 8 has a population of only 57 as compared to his 1979 OPC rookie that has a population of 824 in the same grade!