The gestation period for an elephant is 640 to 660 days. This is equivalent to about 95 weeks, or 22 months, and is the longest gestation period of any mammal.
Dimes dated after 1964 are copper-nickel clad and contain no silver. Quarters are also clad, except for the bicentennial commemorative coins with an S mint mark that were produced for mint and proof sets. Kennedy half dollars from 1965 to 1970 were 40 percent silver composition. After 1970, all Kennedy halves were clad, except the same S bicentennial issue.
Well 1964 is the last year but there a few 1965 dimes out there that were mistakes and are silver. Coin: 1965 Silver Dime. Estimated Value: $9000+. Background: The official production of silver dimes were discontinued in 1964. Begginning in 1965 dimes were made out of copper and nickel. A silver 1965 dime is a mistake (and a rare one).