How much is a four-cent Project Mercury stamp worth?

Answer

The worth of a four cent Project Mercury stamp is actually rather low because it is very common. It usually retails for around five cents or fifty cents in a pack of four.
Q&A Related to "How much is a four-cent Project Mercury stamp..."
When I list them on eBay, I usually get $3.95 per full mint sheet of 50.
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Kaycee, There have been a number of different 4c Lincoln stamps issued over the years, and there is not enough information in your question to identify which one you have. Assuming
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20 cents.
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Nothing.
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