If you found the coin in circulation its worth about 3-6 cents. If it is in original mint packaging then it is worth about $1
i got 5000 for mine
All circulation halves dated 1971 to the present are made of copper-nickel and have no extra value. 1970 halves were made of 40% silver and only sold to collectors. There's more information at the Related Question.
The US Mint in Philadelphia struck .............613,792,000 quarters in 1990. The US Mint in Denver struck .....................927,638,181 quarters in 1990. The US Mint in San Francisco struck ...............3,299,559 proof quarters in 1990. Total number of quarters struck in 1990: ..930,938,353
To clear things up a bit: first, the U.S. only struck steel cents in 1943. Current cents are struck on zinc and coated with a thin layer of copper plating. Second, the only 1990 cents to have an S mint mark are those in sealed proof set packages. All circulation cents since 1975 have only a D if struck Denver or no mint mark if from Philadelphia or West Point. Now for the good news! Your coin could be missing its plating for one of two reasons: either it was never plated at the Mint, or someone dipped it in acid. You'd have to take it to a dealer or appraiser to be sure. If it wasn't plated at the Mint, it's a fairly uncommon error that might retail for up to $100. Unfortunately, if it was acid-dipped, it's only worth face value, so you will need to arrange for someone to inspect it in person.
Germany.
To start with a 1990 Lincoln cent is NOT copper, they have been made from ZINC (.992) with a thin copper (.008) plating since 1982. The coin is face value.
There is no such thing as a silver 1990 penny, as U.S. pennies were made of 95% copper and 5% zinc from 1982 until the present, and prior to that, they were made of 95% copper and 5% tin and zinc. The last year U.S. pennies were made of silver was 1981, and those were only produced in very limited quantities for collectors. Therefore, a 1990 penny is not considered rare, nor is it made of silver.
It is worth face value.
Impossible to tell without actually seeing the coin.
All pennies since 1983 are made almost entirely of zinc, covered with a thin coating of copper. Therefore, what you have is either a zinc penny that did not get its copper coating (worth abuot a dollar), or a normal penny that has been silver plated (no added value). You should be able to determine this by weight. A normal penny will weigh 2.5 grams. So if yours weighs less, then it's missing its copper coating. If it weighs more, then it's been silver plated.
1990 Copper Bowl - 1990 TV was released on: USA: 31 December 1990
$0.01
Penny Crayon ended on 1990-10-01.
It is worth a penny.
Copper Blue was created in 1990.
There is a mint error 1990 proof cent that was minted without the "S" mintmark. If you have one of these proof coins, it could easily be worth $5,000
One cent. Please check your pocket change. While all other denominations carry mint marks, the only circulating cents that bear a mint mark are from Denver. Those minted at Philadelphia (and occasionally at West Point) do not have mint marks. There is a rare proof version of a 1990 penny without a mintmark that was produced in San Fransisco which is worth anywhere from $1,000 to $2,000. Those come in a special set with a case and have a higher relief cameo with a thicker layer of copper coating.