Not very much. Pennies were made from steel in that year because the war effort needed the copper. However, there was a sheet of copper pennies made during that year "by accident", and some of them are still in circulation. Those pennies can be worth thousands of dollars.

Probably under $1 if it's been circulated

http://coins.thefuntimesguide.com/2008/0...

The real prize would be one of the few copper pennies made that year

http://cointrackers.com/coins/13594/1943...

The coin store here gives them as change when you buy something, valuing them at one cent.

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