Please see the many, many other posts on this site that explain how these novelty items are made. They sell for a few bucks in magician's shops and the like, but have no value as coins.
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Look closely with a good magnifier. There will be a seam; it may actually be near one side of the coin rather than the middle of the edge.This question comes up regularly and the answer is always the same - double-sided coins with two heads or tails and different dates are fakes. Use this site's Search function to find hundreds of similar posts.
The probability of 2 coins both landing on heads or both landing on tails is 1/2 because there are 4 possible outcomes. Head, head. Head, tails. Tails, tails. Tails, heads. Tails, heads is different from heads, tails for reasons I am unsure of.
On the obverse (heads) side is an image of President Thomas Jefferson, and the reverse (tails) shows his home Monticello.
There is no difference in sound landing heads or tails.
Zero percent.Zero percent.Zero percent.Zero percent.