I got a box of nickels today,And the bank teller told me these were left in the coin counterearlier this week.The 2 pfenning coins are the same date but have different mint marks.D and C.
D is the mark for Munich. What you read as a "C" may actually be a (more Gothic) "G". If so, that mint is in Karlsruhe.
I'm not familiar with a "C" mint mark on a modern German coin.
Don.....