Putting together this checklist of Sandy Koufax cards and oddball collectibles during his playing days just never ends. You can check out Part I (1955-59) here. Part II (1960 to 1962) here. Below is Part II - which covers 1963 to 1964. Click on any pic to embiggen. BTW, if I am missing any card issues please let me know.
#9 - 1963 Topps - NL Strikeout Leaders
#23 - 1963 Topps Peel Offs - Blank Back
These 1 1/4" x 2 3/4" little stickers were inserted into packs of 1963 Topps regular issue baseball cards.