Finally Found One! 1970-D Quarter Struck On Dime Stock

@Cu: If was from the dime roll was suppose to have same high. Do not go just by the weight it is not what can decide in this case, many others factors come in considerations.

Yes some errors past through no doubt. The check some coins randomly on batches of 2000 coins, so the possibility to catch all errors for me is 10 to 2000.

Like I post before here on this treat, planchet by Mint mean the roll and the cut coin before no others intervention. You guys say stock for the rolls.

Now to explain the rolls: Thos rolls pass in what we say Laminors or rolling machine in order to achieve the right thickness (something like any one know the pasta machine). Due to the forces applied to thinner the material, the begins and the ends of those rolls are thinners then the rest of the roll (planchet). They cut those ends but not always precisely so like this we can find thinners coins.

Now to explain the word planchet. Planchet meaning it is an raw flat material from which will be develop by different processes an end product.

Hope was enough clear..

Stock material in the rolls.
When cut they are called "blanks".
when the proto rim is added, then it is a "planchet".
When they are struck, they are called a "coin". (even it the coin is an error coin)

So on this coin, the wrong stock material was used.
The "blanks" were cut from "dime stock" instead of "quarter stock". The "setup" was not as successful, as the normal height of the planchets were dime height and not as tall as a normal quarter setup.
The strike was weaker as the "height of the planchet" was short in metal on "dime stock". Thus the weak strike of these quarters, being on "dime stock". They will be found in rolls of quarters, not found in "dime rolls". (The size of the "quarter" wouldn't fit into the "dime rolls")

Hope this helps.

This may be a wrong stock metal error, thinness of dime. Found for 1965, 1967, 1970-D, 1979. 1970-d easily found weight 4.2 to 4.4 and thinness like dime. circulated value 1970-d 20-30, uncirculated 50-80 Description: look at the thickness of the edge and very weak or poorly defined features. look for very weak details and a quarter that is the thickness of a Roosevelt dime, with very few detailed reeds on the coins edge.

@Data: Please, can you give the provenance of this information? Interest me.

Nice purchase for $1.50.

I have information collected from a large variety of different sources as I was learning over the years. In this case however I just used the information from the book Strike it rich with pocket change (Latest 5th edition) starting on p239, 243 since it covered the description of what to look for to identify the error that was missing in this thread, the years of the error known to be found on quarters and covers all of them separately. It also covers the most current suggested values which is why I find it a good source of information to consult. In general the values in that book are accurate since its a recent edition, however 'quality' coins such as top grades can go substantially higher than whats listed as the book is focused more on grades found in pocket change so if you have a prime example you may well exceed the pricing and of course there is always variation in pricing with auctions and demand changes. A great find for $1.50.

Quarter struck on dime stock. Right?
Yes (on dime thickness stock) which is different than struck onto a dime planchet. It is a quarter with a wrong stock metal error, thinness of dime. NGC lists it as 25c struck on 10c thickness stock (4.2g is the weight in this image).

Thanks datadragon