Possible 1978-S DDO?

[Sdshdhntr]

Coin roll hunting tonight, I found my first proof quarter and when I took a closer look, I found what looks like doubling. Is this true doubling or machine doubling. Pics are of the "BE" in LIBERTY, the "97" in the date and doubling on the bottom of the letters in "IN GOD WE TRUST"? Thank You for your time and opinion.

S20210211_0001.jpg S20210211_0002.jpg S20210211_0003.jpg

[mustbebob]

This is MD. The absence of notching and the flat surface of the doubled area is the giveaway here.

[MintErrors]

Here is something to take away from the Mechanical doubling/Strike doubling/Machine doubling VS. Doubled Dies:

https://errorcoincollector.org/index...hine-doubling/


Doubled Die (aka Hub Doubling)

• Doubled Die (aka Hub Doubling) Prior to 1996, the Master die was placed in a high tonnage press
• A blank working die was warmed up to make the transfer of the design easier.
• The blank working die was placed below the master die.
• The dies were pressed together with about 20+ tons of pressure.
• The mint workers did not know if the design features transferred correctly. So they would remove the die and inspect it.
• If the working die did not have a satisfactory impression from the master die, the die was warmed up and placed back under the master die for another impression (strikes).
• When the workers placed the working die for a second and potentially other additional impressions, if the die was not correctly lined up it may cause a second impression to be visible.
• These additional impressions if they were slightly rotated or off on any axis, it caused the additional impressions to be visible and thus called a "doubled die".
• Once the die impressions were acceptable, the die was inspected.
• The newly created die (with multiple impressions) was added to a coin press.
• This working die with the multiple impressions begins to make coins and will transfer the multiple impressions from the die to the struck planchet (coin blank).
• These coins are typically business strikes and are released in the community where coin collectors find them and report them to the news and coin collecting societies.

How to recognize a doubled die

• Doubled dies can be visible on the Obverse or Reverse of the coin, or both.
• A Doubled die on the obverse (front of the coin) is called a Double Die Obverse (DDO) .
• A Doubled die on the reverse ( back of the coin) is called a Double Die Reverse (DDR).
• Doubled dies may be subtle or severe.
• Doubled dies usually show the doubling at the same height or very close to the same height of the original impression.
• The features on the coin that are affected by the doubled die may be thicker than normal.
• The doubled die may exhibit a thin "cookie cutter" style line that indicates where the letters, numbers or features overlap.
• Doubled dies may exhibit "notching" or an area near the end of a number, letter or device that shows where the doubling ends.
• Doubled dies typically do not exhibit any sort of damage in the area of doubling. Any damage seen could have been done after the coin left the mint.

Machine Doubling (worthless doubling video)
https://errorcoincollector.org/index...hine-doubling/

[jcuve]

I agree with the machine doubling. You're sure it's a proof? I just cannot tell and there's no mintmark shown. Nevertheless, machined doubling is very common on proof issues.

[Sdshdhntr]

Jcuve.. Attached is the mint mark It's pretty scratched as it has been in circulation. I found it roll hunting.

[jcuve]

I see it. Not often you find a spent proof like this

[Ronald Ozimek]

Thanks so much for the link to the video! It helped me very much. I have a stack I put aside that will likely all be machine doubling that I look forward going through and confirming with my newly gained knowledge.