There is no straightforward way to tell, just by looking at the coin. To determine a coin's value, you need to consider its denomination, date, mintmark (if any), and condition (wear, damage, cleaning, etc.). When you know these factors, then you can look it up in a price guide. Check out my FAQ page for pricing and grading links : http://www.workingmancoins.com/FAQ/index.htm
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On the 1969 S penny a doubling of the print makes it very valuable ($35 000)
1944s wheat Penny
For all practical purposes, .000047% of a penny is nothing. A penny is the smallest legal tender in the United States. The least-valuable currency in the world right now is the Iranian Rial, and even that only gets you 422.75 for a penny. No currency is inflated enough to be worth less than a millionth of a penny.
I'm am sorry i do not know
No, most 1955 cents are not that valuable. There were only a few that were double-struck*. You can see a nice picture of one by using the link provided. (*) As you have noted from other postings, coins are said to be minted or struck, not "stamped". I don't know why, it's just what's done.