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 Replies: 12 / Views: 5,034 |
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Bedrock of the Community
United States
62064 Posts |
Here is a quote from another site: I'm thinking it was Matt Diamond: Quote:Flat field doubling : This coin exhibits dual images as a result of having its machine doubled image flattened by the second strike of a proof coin. This is a very common phenomenon on proof coins from 1950-1974. Second Strike Doubling from a loose die : This is the first of two exceptions to the rule which says that doubling must show on both sides of the coin. This coin exhibits doubling on the anvil die side of the coin only due to the die being loose and turning between strikes. This type of double strike usually only affects proof coins which are normally struck twice. So the second strike flattens the design and you see only a portion of the first strike. They are not a premium coin, but when you look at coins in the range mentioned you will see these sometimes often. Here are a few.  Some are very light as in the case of this one. You can actually see if better on the coin, than on this image.  Flat field doubling do not reduce the devices like machine damage does. But being they are both from the same method, they are still machine damage.   These are stronger examples. You can see where the devices were flattened next to the rims.  Note how the devices are reduced on classic machine damaged examples we often find. On these the die moved during the strike and reduced the size of the devices on the date. A couple of images from Pennyman007:   Edited by coop
02/20/2015 09:42 am
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Pillar of the Community
Canada
2632 Posts |
Good thread Coop. I know you use Canadian coins in some of your examples so if yoou want to use these thats fine by me. Flat Field doubling  Notice the beads are doubled but the letters I think may be a victim of Mortar set (missing chrome around the lettering of the die itself) so this coin may have both..  |
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Moderator
 Canada
10456 Posts |
You sometimes see this phenomena on business strike Canadian nickel dollars... which are not struck twice...  "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Bedrock of the Community
 United States
62064 Posts |
If you could post an image that would be great. I'm thinking on these it maybe machine damage if the devices are reduced in size.
On Canadian dies, they also plate them sometimes and when the plating peels off, you can see that area on the coin.
(a couple more coins I would like to have images of.)
Edited by coop
02/20/2015 10:24 am
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Moderator
United States
23522 Posts |
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Moderator
Canada
10456 Posts |
Here are some nickel dollar business strikes, they are not zoomed in that much - just so there is no doubt that these are business, and not proof-like, strikes. Send me a PM if you want a higher resolution images. As for the peeling chrome dies, that leaves a totally different raised texture (Hans Zoell originally coined the term mortar set for those). For the 1971 and 1974 examples below, it really does look like flattened Machine Doubling, but again, these are not struck twice... This feature is extremely common in the 1968 nickel dollars, so much so, that if you want me to send you a pristine example in both proof-like and business strikes for free, let me know in a PM. In return, I would only ask for a prize donation to CCF for future FUN or ANA shows. 1968 business strike (PS - the lines you see are rolling marks - I have currently having a long discussion with Mike Diamond about those, and will be the subject of a future Errorscope article).  1971 business strike  1974 business strike  "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Pillar of the Community
Canada
2632 Posts |
Those pics look great Coop thanks.  Here is a full obverse and reverse. 1969   |
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Pillar of the Community
United States
2734 Posts |
Error coin writer and researcher.
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Bedrock of the Community
United States
62064 Posts |
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Pillar of the Community
Canada
2632 Posts |
Impressive Coop, I'm glad to contribute to your library.  Quote:
imperfectly aligned proof strikes True enough when you think about it thats all it really is..error-ref.com is my favorite site, tons of info and pics. Thanks for your part in putting that site together mikediamond. Edited by Alexer
02/21/2015 03:05 am
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Pillar of the Community
 United States
5828 Posts |
Great post! I now know a bit more about errors!
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Bedrock of the Community
United States
62064 Posts |
Coopthread=
Added this to make searching easier.
Edited by coop
07/23/2016 1:53 pm
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Bedrock of the Community
United States
62064 Posts |
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Replies: 12 / Views: 5,034 |
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Posted 02/20/2015 08:52 am
