There are a few explanations (if this truly is a mint error)
The first and most valuable would be a quarter struck on a nickel blank, such a coin would be worth quite a bit of money.
The second most valuable would be a coin that was a clipped planchet (blank) such a coin has a cut on it, but as this can be done after minting so it is best to see a coin dealer about this.
But, it is always possible this wasn't done at the mint, but was done afterwards. So you need to see a reputable coin dealer to get it evaluated in person.
One is not a nickel, it is a quarter. The other coin is a nickel.
If it's so worn that you can't make out the year, it's only worth its metal content. If it's an old silver coin, it might be worth $2.50 or so as scrap. If it's a modern copper-nickel quarter that is that worn down, it's only worth a quarter.
By far it is the penny.
copper-nickel and its worth 2.00$
In order to determine the estimated value of a quarter the date must be known.
One coin is a quarter and the other one is a nickel. The quarter is NOT a nickel!
One is not a nickel, it is a quarter. The other coin is a nickel.
Assuming American coinage, the two coins would be a 25 cent coin and a 5 cent coin. Assuming non-American coins, one is not a 10 cent coin, but the other one is. The other coin being a 20 cent coin.
To answer your question, I will need to know the denomination - is this coin a nickel, dime, quarter, etc?
A quarter and a nickel. It is a trick question. One is not a nickel, but the other is.
The one is a quarter and the other one is a nickel
A quarter and a nickel. The quarter is the coin that's not a nickel!
It's very difficult to evaluate a suspected error coin based solely on a description. These coins should be examined in person by a dealer who's familiar with minting mistakes.
There's no such coin as a Jefferson quarter. Jefferson is on the nickel. If you have a quarter the portrait shows George Washington and the coin is worth about 0.18 times the current price of silver. If you have a nickel it's only worth 5 cents. It isn't a key date and it isn't made out of any precious metals.
You have to use a quarter and a nickel otherwise it's impossible.An Explanation ...This is a common brain teaser. If one coin isn't a nickel, it's the quarter. The other coin is the nickel.
The thickness of the US 25¢ coin (quarter) is 1.75 millimeter. The thickness of the US 5¢ coin (nickel) is 1.95 millimeter. The nickel is 0.2 millimeter ( 11.43% ) thicker than the quarter.
That was a transitional year for the coin's composition. If you have a silver quarter, it's worth up to about $4. If you have one made of nickel, it's worth face value only. A coin made of silver will not be attracted to a magnet, but the nickel ones will stick.