Common Wheaties (wheat back cents) are usually only worth 5-10 cents even if there is no damage. Spend this one on nation coin collecting day.
If the reverse shows wheat ears, yes it is 1939. If the revers shows a memorial it is 1959 or newer. As damaged as your cent is I am afraid face value is all it is worth.
The 3 and the 9's don't seem to match a 1939. It more matches a 1989. Zinc rot coin. Only worth 1 cent if you are able to redeem it as a mutilated coin.