They minted 37,489,832 pennies in 1888 plus another 4,582 proof struck coins. They had many 1887 coins left at the mint, so they struck the date 1888 over the 1887. You can see some of the seven at the side of the last 8. The value of the coin is tied to the condition, unless you find the overdate. Two bucks for fair condition, 120 for uncirculated.
In 1969 Jim Ruddy announced finding the first of the overdates. Only two uncirculated coins have been found, but many regular condition coins have. they go for 1,020 to 26,500. So it is worth the search. My coin is fair, barely readable. It is worth about two dollars. But it is old and worth hanging on to.
Mr James B. Longacre designed the coin. The mint did not do any other mint marks, so Philadelphia is the only mint that struck the penny that year. First minted in 1859. Was the first coin to feature an American Indian on it.