You didn't say anything about the mint mark, so here's the range for conditions ranging from numismatic "Good", which actually means very worn, up to almost uncirculated.
With no mint mark (Philadelphia) - retail is 15c in G, up to about .50.
With a D mint mark (Denver) - 50c to .
With an S (San Francisco) - 50c to .
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There is no such thing as a "wheat head penny". Assuming you are referring to a 1917 Lincoln cent, its value depends on its condition and mint mark. See the Related Link for "Lincoln cent prices" to the right. In circulated condition, you'll get about 5-10 cents for it.
Value is 3 to 10 cents for average circulated coins.
1917 Wheat Penny: With no mint mark, in good condition is worth $0.20, uncirculated is worth $25.00. With D mint mark, in good condition is worth $0.25, uncirculated is worth $110.00. With S mint mark, in good condition is worth $0.40, uncirculated is worth $125.00.
Average circulated coins are valued at 3 to 10 cents. Mint State coins can be $20.00 or more.
Assuming your 1917-S Lincoln cent is genuine, then in average circulated condition, it's worth 30-50 cents. Lighter (in color) and less shine probably means it has been cleaned improperly and most collectors would not be interested.