A 1994-D what? Post new question.
The U.S. never minted a silver penny. It would have more than a dime's worth of silver in it. 1983 and later cents are all made of copper-coated steel so you may have a cent where the copper coating was removed with acid (worth only a penny) or was never plated in the first place (worth a significant amount). It would need to be inspected by a dealer who handles error coins.
This is a common error called a lamination error. It occurs when part of the copper-nickel outer cladding doesn't stay bonded to the inner copper core. Lamination errors on state quarters retail in the $10 range.
If there were one it would be a major mint error. But all circulation half dollars dated 1971 and later are made of copper-nickel, not silver, and are only worth 50 cents assuming you found them in change.Silver half dollars were again minted starting in 1992, but only for special collectors' sets.
It would be beyond rare because there are no real silver cents. You almost certainly have a plated coin that's worth only a penny. There's a faint possibility that it's a genuine cent that never had its copper coating applied at the mint. That's actually an error coin and can be worth $50-$100. The only way to tell would be to have it examined in person by a knowledgeable dealer or appraiser. But that was to get your hopes up, it's worthless, give it to me.
Half dollars dated 1964 and earlier are 90% silver and are worth about $11 in silver content. Keep in mind that proof, error, and key date coins may be worth much more than pure silver content. And from 1965-1970 the half dollar was 40% silver and is worth about $4.50 in silver content. Half dollars dated 1971 and later are not silver unless found in a US mint silver proof set. Note that any half dollar made during 1965-69 is only partially silver and is worth about $3. Halves dated 1971 and later contain NO silver and are only worth 50 cents.
They never made pennies out of silver. but in 1943 they made a steel penny because during World War 2 copper was scarce. There were a few error copper or silver error coins accidentally made.
40,000 if in vgc
It may be a Mint error only in that the coin is an uneven thickness, in which case it would be a planchet error. If the coin is not damaged otherwise (excluding the bubble), though, then it's probably not a provable Mint error. The bubble is probably a lamination problem, which can also be a planchet error. This occurs when the cupro-nickel layer (the "silver" colored layer) separates from the copper middle.
It is a normal wheat penny made of copper. The only year wheat pennies were not copper is 1943 which is a zinc-plated steel penny.
It depends what you mean when you say "the image is upside down":-- If you mean that the front (or obverse) of the coin is upside down relative to the back (or reverse) of the coin when rotated around a vertical axis, this is called coin orientation (as versus medal orientation, in which both the obverse and reverse are oriented the same way) and is how the coin is (and indeed, how all US coins are) supposed to be minted.-- If you mean that the portrait on the obverse is upside down relative to the wording and date on the obverse, then you are describing an error that should not be possible given how the coin dies are produced.-- If you mean that there are two images of the portrait on the obverse, one upside down relative to the other, this would be a double struck error, and would have value to an error collector (especially as such error usually have the second striking more or less aligned with the first).-- If you mean that there is a shadow of an inverse (that is, mirror image) of the portrait on the reverse of the coin, this is called a brockage error and has value to a collector of coin errors.
Unlikely. A chemical reaction can strip off the thin copper coating and leave the silver-colored zinc behind, this is not a mint error and as such has no collector demand. Its worth only a penny.
This coin could be a coin with a 'Lamination' error, if so it could be worth as much as $18.00.
It is unlikely that you have a clad 1964 quarter, all quarters dated 1964 should be 90% silver, not the copper-nickel clad of 1965-present. Look on the rim of your coin, if it is a solid color (usually solid white but silver tones easily to different colors) it is silver, if it has a line of copper through it it is clad (compare it with a quarter from your pocket change). If it is clad, it is an error and worth quite a bit of money. If it is silver it is worth about $6 for the silver content.
probebly [sic]are you 100% sure that the brown is copper?More ...You may have what's called a lamination error. That happens when the outer cladding on a coin (which is copper-nickel, NOT silver) loses its bond with the inner copper core. That can happen before or after the design is struck on the coin, but in either case it can definitely be worth a premium. I've seen these listing for about $5 to $7 retail as of 02/2010.
90%, the same as all silver dollars made up till 1935.
10¢ if you found it in change unless it's missing its mint mark above the date. That error is considered to be very rare, but beware of dimes that have been altered to remove a normal mint mark. Dimes made in 1965 and later are made of copper and nickel, not silver, and are only worth face value. Check your pocket change for lots more of them. If you have a coin that appears to be silver it was probably plated for use in a bracelet or similar jewelry. Proof dimes dated 1982 are worth about $1. It is worth face value unless it has no little "P" on the obverse. If it doesn't have one, it is a very valuable error worth more than $300
It likely has been plated, but it's possible it may be a wrong planchet error meaning a dime planchet some how got mixed in with the 1 cent planchets. I suggest having a dealer or collector assess the coin.