Uncirculated Coins

Penny (United States Coin) - Lincoln Cent - Mint Errors Specific To Lincoln Cents
... Some random errors, such as an off-center strike, slightly increase the value of the coin, and are sought after by niche collectors ... However some errors were systemic, and produced a number of coins with exactly the same problem in the same year ... This coin is extremely rare in high grades ...

Eisenhower Dollar - Silver Issues
... All of these coins were minted at the San Francisco Mint, with dates 1971, 1972, 1973, 1974, and 1776-1976 ... very small numbers of 1974-D, 1976-D, and 1977-D silver clad coins were minted and released to circulation.) The San Francisco silver clad coins were either uncirculated or proof ... For the first four years uncirculated coins came in cellophane with a blue plastic token in a blue envelope, while proof issues came in a proof set-like plastic case ...