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This is Strike Doubling (Machine Doubling).
Incuse Design Strike Doubling Visited
by Ken Potter - NLG
October 15, 2002
Originally published in Ken Potter's November, 2002 Varieties Notebook column featured in Coin World
In previous columns, we explained that Strike Doubling is generally accepted to be created by looseness in the press, which in turn causes vibrations to set up during the coining operation. This may cause the upper die to bounce against the struck coin a split second after it is struck resulting in an area of the field parallel to a design (on the die) smashing down a section of raised designs on the coin. Depending on the orientation of the coin on the lower die, (which may shift slightly during ejection) this flat shelf of doubling that borders one side of raised design elements may be found on the obverse and/or reverse and is usually what researchers point to as an identifying diagnostic of strike doubling.
However, in our previous treatments of this subject we have examined variations from this flattened to the field rule, including doubling formed as a design is smashed down a slope, how some design elements in the field that closely border a design may be are raised up into another design area during die bounce, and the effect of a die that slides and pushes metal up the side of a design.
This month we examine a 1984-D Olympic Dollar sent in by Jeffrey Vasington of CT. The doubling on the date and legend bordering the lower rim is outrageously strong and it appears to be a classic example of hub doubling complete with separation lines between the doubled images and a strong notching effect in their corners. Conspicuously absent is the flat shelf-like type of damage typical of strike doubling.
They say: if it walks like a duck and quacks like a duck, then it must be a duck. Thus the doubling shown here must be hub doubling! Right? Wrong! It's Strike doubling! While the doubling seems to break all the rules of what we have learned to expect strike doubling to look like, the answer is simple and easy to understand.
Unlike the majority of coins that boast raised images, the effected elements noted above are incuse designs on this coin and are thus raised on the die. Since they are raised on the die, any bouncing of this portion of the die into the coin will be exactly like a hub or punch sinking images into a die blank! The result is an effect exactly like that found on a doubled die yet it is simply another manifestation of strike doubling as form of damage that adds no value to a coin!
Other design areas on the coin that are raised in the typical fashion we are used to encountering on U.S. coins, such as the Mint Mark; L of LIBERTY and IN of IN GOD WE TRUST, exhibit typical flattened down strike doubling.Ken Potter
CONECA Public Relations
Member of: CONECA-HLM, ANA-LM, MSNS-HLM, NWDCC, CSNS, NLG, IASAC, Fly-In
Visit my website: http://koinpro.tripod.com
Visit CONECA's Website
Unless otherwise noted, images are by Ken Potter and copyright Ken Potter 2015.
CONECA Notice: Any individual is encouraged to submit articles, opinions, or any other material beneficial to the numismatic community. Contributions should not be libelous or slanderous; ethics and good taste shall be adhered to. Opinions expressed herein do not necessarily represent the official CONECA policy or those of its officers. The act of submitting material shall constitute an expressed warranty by the contributor that the material is original; if not, source and permission must be provided.
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Error catches eye
Posted on June 8, 2015 by Ken Potter
Chris Seelke of New York recently opened a 2015-S silver proof set that he ordered about two months ago only to find very unusual doubling on the Louisiana Kisatchie quarter. The doubling is what I refer to as “Displaced Design-Strike Doubling” and is quite rare. Prior to this I have only seen it on two 1992-P Jefferson nickels and on a 1994 Lincoln cent.
Is this Displaced Design-Strike Doubling showing partial letters along the rim of the quarter visually interesting enough to give it collectible value?This proof coin was first struck twice normally as all proof quarters are and then “struck” again via die bounce with high points of the die smashing into the coin.
Generally, we associate Strike Doubling with the destruction of an image, (via flattening), but in this case it has actually formed a new partial image of the incuse letters LO of LOUISIANA. The lettering about the rim for the America The Beautiful series is incuse (sunken) and thus raised on the die. This lettering being raised on the die allows that area of the die to sink images into the coin. I have seen hundreds of examples of Strike Doubling on this series that look every bit to be doubled dies. The effect is very deceptive to collectors who are unaware of the effects from raised images on a die. However, this one takes it to an all new level.
Strike Doubling is one of the most common forms of doubling found on coins and is generally accepted to be a form of damage (to the coin) that occurs a split second after the strike. It is what others may refer to as “Machine Doubling,” “Mechanical Doubling,” “Shelf Doubling,” “Chatter” or a host of other terms used to describe the same or related effects. While the terms may vary among specialists, most agree that it is a very minor variation that occurs during the manufacturing process, that it is not a die variety and is too common to quote any extra value on.
The formation of an image independent of the original as exhibited on this coin gives researchers reason to re-examine the long-held rule of thumb that Strike Doubling adds no extra value to a coin. In a past article on this subject that I wrote in 2002, involving a 1992-P Jefferson nickel where an extra set of designer’s initials appeared, some specialists felt “Displaced Design-Strike Doubling” is so unique that it should carry a value of about $25 or more. (Note: while there are technical differences between formation of doubling on 1992-P nickels and the 2015-S proof Kisatchie quarter, the effects are basically the same.)
Seelke found the coin while examining it prior to taking the set to his father who obtains one proof set and one mint set annually.
What do you think? Readers are asked to contact Ken Potter at his email below. In the event more of these are found, Numismatic News would like to attempt to evaluate just how common or rare it is.
Ken Potter is co-author of “Strike It Rich With Pocket Change” and has penned many feature articles for “Numismatic News” and for “World Coin News.” He is also a member of the board for the Combined Organizations of Numismatic Error Collectors of America. He can be contacted via email at kpotter256@aol.com for more information on CONECA, or to comment on this article. An educational image gallery may be viewed on his website at www.koinpro.com.
Images of Kisatchie quarter courtesy of Dr. James Wiles/VarietyVista.com. 1992-P Jefferson nickel submitted by Michael Westcott.
This article was originally printed in Numismatic News Express.
- See more at: http://www.numismaticnews.net/articl....Am0Hr30G.dpufKen Potter
CONECA Public Relations
Member of: CONECA-HLM, ANA-LM, MSNS-HLM, NWDCC, CSNS, NLG, IASAC, Fly-In
Visit my website: http://koinpro.tripod.com
Visit CONECA's Website
Unless otherwise noted, images are by Ken Potter and copyright Ken Potter 2015.
CONECA Notice: Any individual is encouraged to submit articles, opinions, or any other material beneficial to the numismatic community. Contributions should not be libelous or slanderous; ethics and good taste shall be adhered to. Opinions expressed herein do not necessarily represent the official CONECA policy or those of its officers. The act of submitting material shall constitute an expressed warranty by the contributor that the material is original; if not, source and permission must be provided.
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