What is the value of a 1987 D penny that appears to be made of nickel?
More than likely, this is a standard cent that is not copper-plated. Since 1984 all US cents have been made of copper-plated zinc. Missing the outer copper coating, your coin is worth a couple of dollars.
An Australian 1987 cupro-nickel 20 cent coin was only ever released as part of a Mint set. An Australian 1987 cupro-nickel 20 cent coin (Elizabeth II)(Proof), uncirculated and in absolute mint condition could fetch up to $10 AUD. A reputable coin dealer will be able to give a more accurate valuation.
What are the release dates for A Year in the Life - 1987 EM7 Raiders Minus 3 and a Half for a Nickel 1-6?
These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth 1 Penny. A British 1987 bronze 1 Penny coin (Elizabeth II)(Proof FDC), could fetch up to £1 GBP. A reputable coin dealer will be able to give a more accurate valuation.
If the image is centered on the coin blank like a normal nickel, you probably have a common error called a filled die. These are generally not worth anything extra. If the coin is struck off-center, its value depends on how much of the image is still visible. In any case, error coins almost always have to be examined in person by a knowledgeable dealer or appraiser.
The same as every other 2-headed or 2-tailed coin. It's a privately made novelty item sold for a couple of bucks as a magician's coin, but it has no value to a coin collector. If you think about it for a few seconds, what are the chances that a nickel would be struck twice, nine years apart, with both sides being correct and undamaged?