To "truely" complete the Koufax basic card run I needed the Fleer as well as the Topps. The Topps card in 1963 is a much more eye appealing card in my opinion. There is also a lot more of them available that run up for auction and what not. It wasn't super cheap but I didn't get fleeced on it or anything.
63 was quite the year for him. He won Cy Young and MVP. Doesn't happen too often for pitchers. I believe the last one if I remember correctly was Justin Verlander. ERA of 1.88, 311 IP, 306 strikeouts. 11 Shutouts. Just straight domination.
Thanks for reading!