肯尼迪半美元
In 1964, there was a severe shortage of coins. Silver prices were rising, and the public responded by hoarding not only the wildly popular new coin, the Kennedy half dollar, but the other denominations, including the non-silver cent and nickel. Hopeful that issuing more 1964-dated coins would counter the speculation in them, the Treasury obtained Congressional authorization to continue striking 1964-dated coins into 1965.