Through the years I have collected better and better copies (original) of the 1964 Chevrolet Owners Guide manual…My original looks a bit "ratty" after 50 years..I now notice I have 3 different versions of the same manual…there's a 1st, 2nd and 3rd Edition but no Revision date anywhere in the booklets. My original plastic holder for the guide is dated 1/4/1963…another plastic holder has a 1968 date on the back bottom…there are differences in some of the pages..anyone know what the revision dates for the guide were? nthx…Billu38