Curved Clip Error Coin




Curved Clip Mint Error Coin: 1978-D Penny

A curved clip mint error coin is a type of numismatic error that occurs during the production of coins. In other words, a 1978-D penny curved clip mint error refers to a portion of the coin’s circumference being absent. This is due to a misalignment during the blanking or cutting process.

1978 penny error

Furthermore, the blanking process involves cutting round metal discs, called planchets from large sheets of metal. Occasionally, the cutting machine may malfunction or experience misalignment. This results in irregularly shaped planchets.  Moreover, the irregularly shaped planchet used to strike a coin, creates a clipped mint error.




Note the Crescent-shaped Indention

Essentially, a curved clip mint error is named because a missing portion of the planchet creates a curved or crescent-shaped indentation. The location and size of the curved clip can vary, but typically affects a small segment of the coin’s circumference.

1978 penny error list
Curved Clip Mint Error Coin Value

The value of a curved clip error coin may vary.  Moreover, it depends on several factors, such as the severity of the clip, the rarity of the coin, and the demand among collectors.  Additionally, the more pronounced and larger the curved clip, the more desirable the error coin becomes.




To determine the specific worth of a curved clip mint error coin, have it authenticated and appraised by a professional coin grading service or a reputable numismatist.  For a small fee, they’ll assess the coin’s condition, rarity, and market demand to provide a valuation estimate.

curved clip error coin lincoln penny error
Note the Blakesley Effect

The Blakesley Effect refers to a specific type of error that can occur during the minting process of coins. It’s named after a man named Blakesley, who first described this phenomenon.

mint error coins to look for

The Blakesley Effect specifically refers to the raised rim formed along the clipped edge of a coin.  A coin struck with insufficient force or misalignment, displaces the metal pushing it upward.  This causes the formation of a ridge or rim along the clipped area and a flattened area opposite the clip.




Coin collectors find these errors intriguing due to their unique appearance and the circumstances during minting process.  List your own mint error discoveries on Ebay by observing how others have listed theirs.

Curved Clip Error Coin 1978 penny errors

If you’ve found a clipped error coin you think is valuable, then consult with experts in the field to get an accurate assessment of its worth. Online coin groups such as coinauctionshelp.com are extremely valuable resources to be aware of.

best selling coin microscope

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2021 Native American Dollar

2021 Native American Dollar Errors, Varieties, & Values

2021 Native American dollar error and variety coins exist!  For instance, a thorough examination detected an improperly annealed or sintered planchet error, thereby making this a nice collectible error coin.  Furthermore, observe the anomalies on a collectible 2021 Sacagawea Dollar.  

native american dollar 2021

The 2021 Native American dollar coin medal program represents Native American military services.  Moreover, the best approach for finding a rare Native American dollar coin error or variety like this, is to search through original wrapped uncirculated rolls of Native American dollars.  Additionally, searching 2021 mint sets ensures a mint state grade specimen.

Native American History & Heritage

In 2009 the United States Mint began minting and issuing $1 coins, featuring designs celebrating the important contributions made by Native Americans to the history and development of the United States.”- PCGS.com

2021 Native American Dollar error value
2021 Native American Dollar Design

“The obverse design displays Sacagawea carrying her infant son Jean Baptiste.  Furthermore, the reverse shows stars representing five branches of the U.S. military in the foreground, while a circle provides an additional reference to Native Americans.

Moreover, Native Americans have received recognition for their service, including five Medals of Honor during World War II.  Furthermore, their exemplary record of military service continues to this day.” – usmint.gov

military coin 2021
Sacagawea's Military Services as a CodeTalker

“In 1804, President Thomas Jefferson sent Meriwether Lewis and William Clark on the now-legendary transcontinental expedition to explore the American West.

He instructed them to search for the fabled Northwest Passage from the Missouri River to the Pacific Ocean, but he also desired firsthand knowledge of the land, its inhabitants, its vegetation, its mineral products, and its animal life and habitat.” – sos.mo.gov.

“While at Fort Mandan, Lewis and Clark met French-Canadian trapper Toussaint Charbonneau and hired him as an interpreter.  Furthermore, they allowed his pregnant Shoshone Native American wife to join him on the expedition.

Lewis and Clark hoped she could help them communicate by translating for them with any Shoshone encountered on their journey.  On February 11, 1805, Sacagawea gave birth to a son and named him Jean Baptiste.  As a result of her skills, she became an invaluable and respected asset for Lewis and Clark.” – History.com

2021 native american dollar value
2021 Native American Dollar Mintage

“The 2021 Native American Dollar is the lowest minted in more than a decade of mintages before them, with only 2.52 million produced as the total combined with 1.26 million produced by each the Denver and Pennsylvania mints.” – coinnews.net

The 2021 Native American dollar is made of 77% Copper, 12% Zinc, and 1% other, over a pure Copper core.  It weighs 8.1 grams. The golden dollar coin is not made of actual gold, but obtained its name for its golden appearance.

dollar coin error list
Native American Dollar Coin Varieties

Major grading services recognize the up or down imprinting, or orientation of the edge lettering on Presidential and Sacagawea Dollars.  TYPE/POSITION A means that the edge lettering reads upside-down when Sacagawea’s portrait faces up.  TYPE/POSITION B means that the edge lettering reads normally when Sacagawea’s portrait faces up – greatcollections.com

rare native american dollar
2021 Native American Dollar Values

A 2021-P $1 Native American Position Type B graded MS67, sold at auction for $45.00.   Furthermore, a 2021-P $1 Native American Position Type A graded MS69, sold at auction for $172.00.

2021 native american dollar improperly annealed or sintered planchet mint error
Improperly Annealed or Sintered Planchet Mint Error

“Numismatists may refer to the surface discoloration as improperly washed or burnt planchets.  ANACS refers to these as an “Improperly Mixed Alloy.”  PCGS refer to them as struck on “Sintered Planchets.”

NGC calls them “Improperly Annealed Planchets.”  Improperly annealed planchets can take on a variety of colors, from black to copper red.  This error is caused by over-heating the planchets.” – Ken Potter

improperly annealed sintered planchet mint error
Native American Dollar Errors

A most famous Sacagawea coin error is the 2014-D Sacagawea mule dollar.  It has the presidential design on the reverse. – coinworld.com Additionally, rotated die errors and doubled edge lettering are other errors to look for on these dollar coins.  Moreover, some Sacagawea dollars may display weak edge lettering, partial edge lettering, or even doubled edge lettering.

2021 dollar error

“Edge lettering wasn’t on Sacagawea Dollars until 2009.  However, some still slipped away from the mint without the edge lettering.  First, pay attention to the design elements and devices. 

Then look for abnormalities and weigh the coins.  Finally, compare a suspected die variety to a common coin to help identify true differences.”- TheSpruceCrafts

2021 dollar error list
Doubled Die Variety & Error Dollar Coins

Additionally, varietyvista.com has a 2007 P Sacagawea doubled die reverse listed to compare coins with.  Furthermore, look for doubling of the stars!  Furthermore, “American Numismatic Association (ANA) Authenticator Brian Silliman verified that the 2000 Sacagawea $1 coin struck on a hollow-center planchet was certainly legitimate, and potentially worth around $10,000.00. –  money.org.

Moreover, a rare 2000-P $1 Sacagawea Dollar was discovered as struck on an Susan B Anthony Dollar Planchet.  That dollar coin error sold for more than $6000.00!  Additionally, observe the recent sold listings of Sacagawea dollar coins on Ebay!

Moreover, doubled and overlapped edge lettering increases value and can be several hundred dollars in certain grades and dates.  – coinauctionshelp.com

This website is a partnered associate and may contain affiliate links. Full disclosure is found here.   Finally, check out a 2019 Lincoln cent with a partial plating errorHappy Treasure Coin Hunting!

2020 P Connecticut Quarter Doubled Die Reverse Variety Coin

2020 P Weir Farm Connecticut Quarter Doubled Die Reverse Variety Coin

2020 P Weir Farm Connecticut quarter doubled die varieties and errors exist!  For instance, I bought original mint wrapped uncirculated rolls directly from the United States Mint to search through for quarter errors and varieties.  

2020 quarter errors with pictures

Needless to say, I hit a coin variety jackpot!  For instance, observe the 2020 P Weir Farm Connecticut doubled die reverse variety quarter obtained from a mint wrapped roll.  Furthermore, these rare quarters appeared to have a satin-like finish.

At first, I mistook this quarter as incused machine doubling.   However, I decided to check for any new rarity listings on doubleddie.com first, where there are indeed 2020 quarter doubled die variety coin rarities listed!

2020 p weir farm quarter doubled die variety coin
2020 Weir Farm Doubled Die Variety Quarters

Doubled die variety quarters are not only rare, but can drastically increase in value over time.  Doubled die variety and error coins are a lot of fun for treasure seekers with limited mobility to hunt for.  Coin hunters find rare and valuable coins like this 2020 Weir Farm doubled die variety, by taking on a task called coin roll hunting. 

Treasure Hunting for Rare Coins

The work is time consuming, however, it’s rewarding in more than one way.  Additionalyl, collectors show appreciation for their efforts by purchasing errors and varieties for a premium or to auction off using platforms like Ebay.    Personally, I sell them for $5 each in my Ebay store.

2020 error coins to look for
Rare Satin Finish Quarters

Furthermore, “at times  the U.S. Mint has produced and sold “Satin Finish” coins. These are different than the normal circulated examples.  Additionally, satin finish varieties refer to the type of finish of a quarter.

Furthermore, the quarters appear matte, unlike their proof counterparts, which have reflective fields. They’re struck in higher quality, when compared to the coins for mass circulation sold direct from the U.S. Mint to collectors.” – GreatCollections

2020 P Weir Farm quarter errors

The above images are of the die markings on the 2020 P Weir Farm Connecticut doubled die variety listed as 2020-P 25¢ CT WDDR-002 by John Wexler.

Proof-Like Quarter Varieties

Furthermore, satin finish coins have a different appearance than proof, proof-like, or business strike coins. Moreover, these coin aren’t mirror-like.  However, they’re more glossy in appearance.

2020 Weir Farm Connecticut doubled die variety quarter

Additionally, satin finish coins are struck on special sandblasted or “burnished planchets.”  Furthermore, the 2020 D Weir Farm Connecticut mint wrapped quarter roll appeared shinier, and indeed more proof-like. 

2020 Weir Farm Connecticut Quarter Doubled Die Reverse
national park for art quarter

Compare the difference between the glossy appearance of a satin finish strike and a normal business strike finish as an example using the examination of a 2020 W Weir Farm Quarter found last year.

2020 quarter errors and varieties to look for

Some say the United States Mint no longer produces satin finish quarters, and hasn’t since 2010.  Could they’ve produced satin finish 2020 quarters by mistake? 

This website is a partnered associate and contains affiliate links, which enable me to earn commissions from various partners. Full disclosure is available here.  Partners include Ebay, Amazon, Google Adsense, and others.

2020 Virgin Islands Quarter

U.S. Virgin Islands 2020 W National Park Quarter V75 Privy Mark Rarities

2020 W Salt River Bay U.S Virgin Islands quarter errors and varieties exist! Furthermore, this collectible specimen was found in an original wrapped bank roll.  Moreover, the image below displays a rim cud near the “w” mint mark.   Furthermore, 2020 Virgin Islands quarter errors and varieties give these rare low mintage coins unique appeal, increasing the interest of collectors.

V75 W quarter
Arrow notes a Rim Cud on a 2020 W National Park V75 Privy Quarter
Looking For Variety & Error Quarters

Additionally, struck-through cloth error coins are more scarce.  However, they’re found on proof coins, as well as business strike designations. Furthermore, struck-through error coins are mint errors because it involves the coin being affected during production.

For instance, observe an example of 2003 Maine struck-through thread proof quarter, caused from the raggedy edge of a cloth, with a string or fiber pulling loose from a rag.

2020 w v75 national park quarter error list
V75 Special Edition Privy Mark on a 2020-W National Park Quarter

Additionally, Jon Sullivan of Sullivan Numismatics suggests “collecting a particular type of strike through, such as coins struck through cloth, staples, or dropped letters.  In other words, collect all manners of strike-through errors of any particular design of a coin.” – Jon Sullivan/MINTERRORNEWS

2020 Quarter Values

Furthermore,  values depend on various factors.  For instance, the coin type, denomination, and appeal of the appearance.  For instance, Struck-through die cap errors may be worth well over $2,000. In other words, they’re one of the most valuable strike-through errors.  Struck through grease on a cent may be worth around $100 to $200.”  – Daniel of Portsmouth Coins 

2020 W V75 Salt River Bay Quarter

2020 W V75 Quarter Coin Values

Furthermore, 2020 W national park quarters are the only to exhibit the V75 privy mark.  Additionally, these quarters have a mintage of just two million each.  Moreover, values increase as more specimens become worn from circulation wear.  For instance, a 2020-W 25C Salt River Bay NP V75 (Regular Strike) quarter graded MS68 sold for $5,595.00.

Additionally, V75 2020 W mint mark quarters were deliberately distributed via circulation beginning in 2020 to attract a new generation of coin collectors.  Coinage tells history too as genuine works of historical art. 

salt river bay us virgin islands quarter
Salt River Bay US. Virgin Islands Quarter

Meanwhile devout coin roll hunters wasted no time searching for them.  If you find one in pristine condition save it!  For instance, a 2020-W Salt River Bay quarter sold for nearly $1400.00 on Ebay.  Moreover, a 2020-W 25c Salt River Bay NP Quarter V75 Privy graded MS67, sold for $1799.99.

2020 U.S. Virgin Islands Quarter Design

A single immature red mangrove tree is the focal point on the reverse of the Salt River Bay quarter.  The design is meant to assist with bringing awareness to the park’s endangered mangrove forests, and the delicate nature of how the species reproduce in saltwater. 

2020 Quarters
Struck Through Debris

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