What are you referring to? Does the coin have two images of Lincoln? If so, it could be worth a few bucks at retail. If you're describing a coin that has a little picture of JFK or someone else pretending to stare at Abe, you have a novelty piece made outside of the Mint that is only worth a cent. Also, to clear up terminology, coins are said to be "struck" or "minted" rather than stamped. Not sure why; it's just always been that way.
Around $20.00 for a minor mis struck error.
The British New Penny coin was first issued in 1971.
It's worth 2 cents for the copper.
Maybe 25 cents
Average value is $1.00 for a proof 1971-S lincoln cent.
It's a novelty coin that was not made at the mint and has no collectible value.
It's still worth 50 cents, the dates stamped into the coin adds nothing to the value.
If it was found in change, face value to 2 cents depending on its condition. An uncirculated one is worth a nickel.
Indelibly Stamped was created in 1971-06.
I'm not sure what you mean "mixed with a penny". If the coin is made out of copper-nickel like an ordinary dime, but has a cent image struck* on top of the dime image, that's possibly a mint error that happened when a dime accidentally got mixed in with cent blanks and was struck a second time. That's definitely a collectable error but you'd have to take it for in-person appraisal to be sure. If one side is a cent and the other side is a dime, it's a fake made by joining halves of 2 genuine coins, and has no value other than as a curiosity. (*) FWIW, coins are said to be struck or minted, rather than "stamped".
U.K. coins with the denomination "new penny" were only issued from 1971 to 1981. Please check again and post a new question.
the 1971 no mint mark penny cost 10 cents