Hi everyone. I just pulled a '64d LMC while sorting a $25 penny box this afternoon. The 4 on the date is only partially struck. At first I thought the coin could be either a '64 or a '67, but on further research discovered that the Denver mint did not produce any pennies in 1967, so it must be a 1964. Is this error significant enough to bring any extra $$? All other details/features of the coin appear 100% normal, including the mint mark, and the 196 of the year. It is only the 4 that is perhaps 25% visible/partially struck.