Morgan

The coins were actually in circulation and were found by me. Part of a $100.00 on halves I was searching. I was pretty sure they were strike doubling errors but as I am new I wanted to get a confirmation.

After finding these two I found two more. One on a 78-D and one on a 71-D. Im begining to think that strike doubling is preety common.

Dani05

hello,
i'm new here and from germany, where double dies are also popular...

this is a very good thread to inform people about doublings...

if you are interested in seeing some german doublings, here is an very impressiv example:
(if advertising is not allowed, i can delete it)

edited - you are correct, advertising is not allowed

best regards,
Daniel

foundinrolls

Hi,
Mike is absolutely 110% correct. The doubling is the flat shelf-like mechanical doubling that I've seen on well over half a million coins. Coins struck by doubled dies look vastly different.
Check out the notches as seen on the word WE on this example of Die doubling on a 1966 Half. It is totally different than the flat doubling.
Have Fun,
Bill

Attached Thumbnails

 

Just Carl

True this is a great thread and educational. Unfortunately at coin shows around here even the dealers are so unaware of these many types of errors that there is very little value to them. Unless an error coin has made it into the big time fame, such as 1955DD Lincoln Cent, there is little value except if your an error coin collector. Usually only very visable errors are of any value. I've slowly collected hundreds of varieties of error coins and few could be sold for more than a regular coin. Still this is the kind of information I print out.

Dani05

hello, what kind of doubling are the following coins?











thank you for your help!!!

foundinrolls

Hi,
Each German coin is a knockout example of a coin struck by a doubled die!!! There is no doubt there are notches at the tops of letters and or numerals, The 1995 is outstanding! The others are very nice as well.
I have to start looking at my German Coinage, I've already checked my coins of Spain.

The sPanish coin is one I would like to see better pics of, There is an outside chance that it is struck by a worn die and the doubling is caused by what is caused Die fatigue. I thionk there is a good chance though that the coin was struck by a doubled die as well. Better pics will tell for sure.
Thanks,
Bill

Dani05

thnak you!
its hard to take better pix from the spanish one..

i will put all those coins to ebay.. therefore i have to know what kind of doubling they are.. so thank you for your explaning

NICK66

Yeah, but the pictures I see in the Redbook, namely the 1937 doubled die, and the 1943 doubled die Quarters, look a lot like machine doubling. These look too confusing so I keep every coin I get that has any type of doubling because there will always be differences in opinions about doubling.

Treashunt

Mike is correct, you cannot believe everything that you see on a slab.
Recently I wrote to a seller (Ebay) who was selling a 'slabbed' coin (from a real low-budget slabber) listed and slabbed as a 1858/7 Flying eagle.
Nice coin, except that the piece was a small letter 1858, and the 1858/7 is on the large letters Flying Eagle cent.
I wrote to him (the seller) and broke the news. Strangely (no surprise) I never got a reply.
So, the lesson is: believe what you know is correct.
Many of the so called double dies are strike doubling. There are some early Barber quarters with strike doubling that is very deceptive.

pennyante

can anyone reccomend where to look for prices and die varieties,or errors on current dimes, nickels and quarters?
or just prices in general
thank you

GDJMSP

Howdy pennyante - Welcome to the Forum !!


You can find many price guides listed - Right Here

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Tom Maringer

As a coiner I have made my share of doubled-images on coins. The true doubled-die is an artifact of the die-hobbing process. The master matrix (or hub) is pressed into a coned block of annealed tool steel to form the working die. If the impression is not quite deep enough the die-sinker will realign the die and hub and press again. Usually you can feel when the die and hub "lock" back in together... but sometimes there is a very slight shift of position, and a doubled die impression is made. They can be so subtle that they die-sinker may not even see it, and pass the die on to be heat-treated and sent to the press-room. I have inadvertantly made several such doubled-die impressions... even when I thought I was being meticulously careful to avoid them. The main solution to the problem is to refine the die-sinking technique so that a single push with the press created the impression and a second pass becomes unnecessary.

Remember that it takes a lot of dies to make a government run of coins. Typical maximum die life is somewhere in the neighborhood of 50,000 strikes per set. So if a billion coins are to be made with a certain date and mintmark, then it will take as many as 20,000 sets of identical dies to produce them!! That is an astonishing number! So the die-production shop is itself like a small mint operation. In my experience, the doubled die impressions always occur early in the die production process because the particular requirements of the die being made are still being learned. After a few double-strikes are done in the process of determining the correct tonnage setting for the hobbing press, there would be no more die doubling errors.

Machine doubling is something quite else... the idea there is that the die is perfect, but that the coin is struck twice with slight movement between strikes. It can only happen if the coin is struck twice, either on purpose (done to increase die-life by reducing press tonnage or for special proof strikes) or because of a problem in the feed and ejection subsystems. Once the coin is double-struck, the doubling image is because the second strike was not perfectly aligned with the first. This can occur in one of two ways. First, because the lower die in the set moves up and down in the collar it is not held firmly, wear or looseness in the alignment pin can cause a slight rotation of the die. Second, if the ways of the press are worn, the positioning of the upper die may be inconsistant.

In my experience, the machine-doubled image will be a rather "shadowy" doubling by comparison with die-doubling, and on close examination the shadow image will be found to be completely flattened into the field. Die-doubling will show clearly under magnification that there is are two separate images with relief showing between them and with the second image clearly above the field in relief. So I agree with the other people who've looked at the above photos of German and Spanish doubles that these are most certainly die-doubles and not machine-doubles, since they show clear relief.

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louisstraub

When I try to use the links


How Doubled Dies are Created and Their Classes.

Determining Die Doubling from Other Forms of Doubling. (Requires Acrobat Reader)

Take the Doubling I.Q. Test.

Doubling: Worthless or Valuable?


I get
The webpage cannot be found


Is there any other way to access the pages? I'd like to learn more on the subject. By the way your article was excellent. Thanks.......

Speedy

Those pages were taken down when Varietynickels was shut down a few years back. I'm in the working on getting varietynickels.com back up and going but from the looks of things I won't be able to use those articles.

Speedy

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craton

Nice thread!

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