The "S" is not a type but rather a mint mark indicating that the coin was minted in San Francisco. In Good (i.e. well-worn) condition it might be worth 5 or 6 cents; in Fine condition, around 35 cents; in Extremely Fine, about 75 cents to a dollar.
Type in google images and type 1898 wheat penny then you will find it.
The last year Indian Head pennies were minted was 1909. In 1927 the type of penny that was minted was the Lincoln, Wheat Ears reverse (called 'Wheat Penny') A 1927 Wheat penny is worth from $0.15 to $125.00 according to mint mark and condition.
There were no Indian Head pennies minted in 1915. The last Indian Head pennies were minted in 1909. In 1915 the type of penny minted was the Lincoln, Wheat Ear reverse (called 'Wheat penny'). A 1915 Wheat penny is worth from $1.50 to $500.00 according to mint mark and condition.
With a silvery coating on it, it has now become a novelty item with no collector value.
At this time. mintmarks were still hand punched into the working dies at the mint the coins were made at. Unfortunately errors of this type are common, but it still may have some extra value depending on how much of a slant it has. Show it to a couple different dealers for an idea of value, it won't be much.
This is not enough information to give an accurate value amount. Need to know 'Type' of penny, 'Date' of penny and 'condition' of penny.
Coins with errors need to be seen for a evaluation, the type and condition of the error determines value. A dealer or collector can do this.
it is not rare enough to have any value [will have value in about 3 years]
Ask another question and include the date and type of error on the penny.
In you search box, type in 1956 Wheat Cent and click on images, this will show you what one looks like.
That's the type of U.S. cent minted during the years 1909 through 1958.
In you search box of your browser, type in 1937 Wheat Cent and click on images, this will show you what one looks like.