The cards that show stats for 1933 on the back were issued in 1934. The cards that show stats on the back for 1934 were issued in 1935. Cards that show stats on the back for 1935 were issued in 1936.
Here is an image of the back of the 1934 and 1935 Grove Diamond Star cards. 1934 is on the left. 1935 is on the right. Both are green backs.
