I don't know out the 01 50c but the 78 20c is a bit different. As the 9 and 8 seems to be worn but the 7 isn't then I would say they may have been weakly struck to begin with.
The 2001 50 cent has fairly significant doubling in the date,does it have doubling on the rest of the legends etc ? it does appear so by the IA you can see in the pic. The 78 20 cent is weak strike could be caused by grease or similar,not really significant enough to be worth anything IMO.
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