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Machine Doubling Vs Double Die

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CoinHunter53562's Avatar
United States
2049 Posts
 Posted 03/08/2008  8:36 pm Show Profile   Bookmark this topic Add CoinHunter53562 to your friends list Get a Link to this Message Number of Subscribers
Can anyone explain a good way to tell the difference between the two? I found a 1983 with a possible DDR, but I have seen other similar coins posted here with pictures, only to be called Machine Doubling. So if anyone can give some pointers that would be appreciated.


Moved to error variety by metalman
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foundinrolls's Avatar
United States
3507 Posts
 Posted 03/09/2008  12:05 am  Show Profile   Bookmark this reply Add foundinrolls to your friends list Get a Link to this Reply
Hi,

It would be easier if you posted a picture:-)

Some of us could write books on the differences between the two. There are many forms of worthless doubling and each has it's own distinctive look.

To try to simplify it a little, coins struck by doubled, tripled, quadrupled etc. dies have characteristics that are different depending upon the spread of the doubling and the state of the die(s) when it (they) struck the coin.

We look for the duplicated details to be rounded and not flat. We look for grooves between the images. We look for separation of the details, even though a coin with a close spread may have little separation of images. We look for notches on "corners" of letters or numerals. We look for splits in serifs on letters that have serifs.

Many of the descriptions I've given can, to the untrained eye, look similar on coins struck by dies that have multiple images as a part of the die and on coins that have what we call Machine Doubling.

Post a Pic. We can probably tell you what you have and then explain why. That would be easier than writing the whole book here:-)

I have some doubled dies pictured at

http://www.foundinrolls.com

Chuck has a huge sampling of pictures at

http://www.coppercoins.com

You may want to go look at some of the pictures , particularly some of the closeup shots on Chuck's site. It should help.

Thanks,
Bill

PS: The correct term is doubled die. That is not meant to sound smart:-) We try our best to teach the terminology that goes with this fun part of the hobby.

Thanks Again,
Bill
Edited by foundinrolls
03/09/2008 12:07 am
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j_h_s's Avatar
United States
1934 Posts
 Posted 03/09/2008  06:59 am  Show Profile   Bookmark this reply Add j_h_s to your friends list Get a Link to this Reply
Try this as "one" approach. Take a stencil...e.g. the letter "D" or "S"

lay it on a flat surface
lightly spray it with color

lift it up....mint mark
take the stencil and move the entire stencil over half an inch
lightly spray it with a different color
now you have a RPM (RE PAINTED MINT), aka, Re-Punched Mint mark or a DD (DOUBLED DYE), aka Doubled Die.

now,

repeat step one above.
then, move the stencil a little bit BUT, leave one of the corners or angles on the same plane as the original
stencil. repaint with different color.
you'll see that, in many, if not most cases, MD's usually share a primary common angle with less evidence of the entire mint mark actually being repunched.

This is only one hypothesis because there are numerous RPMs and DDs that do not stand up to it.
but it's a start


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