Im pretty sure that 1968 is just a filled die. You will notice the foot is also missing. I have seen 1968's with the foot there and no SD but I'm leaning towards the opinion that the 1968 coins may all be filled dies.
Appreciate the help , got a 1969 coin the sd seems to be partly imposed on the left foot on closer inspections will try to post a pic if I can work out how.Also can you be kind enough to tell me the values of each of your coins , thanks in advance.
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