Wikipedia
Wooden nickel
In the United States, a wooden nickel is a wooden token coin, usually issued by a merchant or bank as a promotion, sometimes redeemable for a specific item such as a drink.
Usage examples of "wooden nickel".
That was very much on his mind on Makin, when things were going badly and he wouldn't have given a wooden nickel for their chances of getting off the fucking beach alive.
My being a medical student counted about the same as a wooden nickel, so far as making them alter their routine.
Not a man of them's worth a wooden nickel, but Lord above, how I do love the wretches.