Not much. Modified coins have no collector value.
It's an ordinary bronze cent that was plated. A lot of 1976 coins were plated with silver or gold and sold as "collectibles" during the Bicentennial, but as soon as the celebrations were over the market for them dried up.
Your coin is only plated silver. The US mint has never made silver pennies. Plating adds no extra value.
What IS a silver bicentennial penny? The US Mint didn't make one, so you are probably looking at a normal 1976 cent that has been silver plated by a private novelty company. It will have no numismatic value but you may get a dollar or so from someone who collects bicentennial memorabilia.
The U.S. Mint never issued such a coin. In all likelihood you have a privately-issued commemorative piece. Most of these small items sell for at most a couple of dollars, and the market is fairly limited these days. What you have is a normal 1976 penny that somebody has plated with either silver, nickel, or zinc. Now a novelty item it has no collector value.
There are two possibilities:A: it is spray paint. Value:$0.01B: it is a wrong planchet. Value: $350These are only silver plated for decorations or jewelry. It is only worth face value. Silver or gold plating adds very little value to a coin.
The gold plated Bicentennial coins dual dated 1776-1976 were plated out side of the mint and not issued by the Us government they are novelty coins and have little or no collectible value.
Face value only.
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The last British Halfcrown was minted in 1970.
Please be more specific, describe the error in a new question.
No US 1976 Lincoln cent or any other year is made from silver.
It may have been plated with gold but it adds nothing to the value of the coin.