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.

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2019 W Lincoln Cent Collectible Coin

2019 W Lincoln Cent Special Edition Proof Coin

A 2019 w Lincoln cent special edition proof coin is unlikely to be found in circulation.  W mint mark pennies were unique collectible coins made available in 2019 mint sets.  For example, like the rare 2000 Native American Dollar in Cheerios cereal boxes

Furthermore, 2019 W Lincoln cent proofs are registry coins.  However, the U.S. Mint made a mistake and sold ninety one West Point Mint pennies individually.” – coinworld.com

2019 w Lincoln cent special edition proof coin

Moreover, if you come across a 2019-w penny, observe and examine it for errors and varieties.   West Point Mint collectible shield cents are already rare, but being an error or variety makes a coin even more scarce.  

Furthermore, only 629,342 w proof Lincoln shield cents were produced.  This makes them extremely rare coins, belonging to less than a million collectors.  In other words, do not underestimate value potential. 

2019 w proof Lincoln shield cents
 2019 W Lincoln Cent Proofs Display Mirror-like Fields

Furthermore, the mint made history by striking the first Lincoln cents bearing the w mint mark.  Moreover, w pennies raked in nice profits in the marketplace.  For instance, “coin dealers started selling each of the three 2019 W Lincoln cents for up to $25.00 each” –  coinnews.net

2019 W Shield Cent Types

Additionally, there are three types of w pennies.  First, the proof penny came with the proof set.  Second, the reverse proof came with the silver proof set, and finally, the business strike w penny came with the uncirculated set. – coinvalues.com

proof penny error
2019 W Shield Cent Values

Furthermore, values of 2019-w cents depend on the condition of each coin.  The lowest population of the highest mint state grades are the most valuable.  Moreover, this refers to professionally graded encapsulated coins.  In other words, the most pristine pennies are the most valuable.

For instance, a 2019-W 1C Shield Cent, graded MS70 RD, sold for $3,606.00.  Furthermore, a 2019-W 1C Shield, DCAM (Proof) graded PR70DCAM, sold for $467.00.  Additionally, a 2019-W 1C Shield – Reverse Proof First Strike (Proof) graded PR70 RD, sold for $300.00.

Moreover, a 2019-W 1C Shield – Reverse Proof graded PR69BN, sold for only $40.00 in 2020.  Observe the recent sold listings for an idea of current market prices.  2019 W shield cent proof coins sell for $25.00 and up in raw condition on Ebay.

2019 w penny worth
Rare 2019 Pennies

Again, it’s highly unlikely to find a special edition w proof coin in circulation.  However, it’s not impossible.  People unaware of the numismatic value of coins unwittingly spend them.  That’s why it’s important to pay attention to pocket change.

If you do find a 2019-w Lincoln cent, then look closely for errors and varieties.  2019 w pennies in raw condition are available to bid on and/or purchased directly from coin dealers online.  For instance, keep an eye open for listings on Ebay.   

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2015 Delaware Quarter Bombay Hook

2015 S Bombay Hook Delaware National Park Quarter Dollar Proof Coin Values

2015 Bombay Hook Delaware national park quarter dollar errors and varieties exist!  Have you found any?  Meanwhile, “the word “Proof” refers to a method of manufacture and does not denote the condition of the coin based upon wear.”  – coinworld.com

2015 s quarter value
The S Mint Mark Refers to the San Francisco Mint Location

 Additionally, the S stands for the San Francisco Mint location.  Obviously, someone spent this quarter dollar coin unaware of its potential value.  

Furthermore, only 1,013,920 Bombay Hook National Wildlife Refuge proof quarter dollar coins were minted by the San Francisco Mint. In other words, it means that only just over a million people can own them.

2015-s bombay hook delaware quarter value

The shiny mirror finish and S mint mark identified this 2015-s Delaware national park quarter as a proof.  Most importantly, the term “proof” refers to the coin’s finish. – usmint.gov

Moreover, proof blanks get special treatment.  They’re carefully packaged to preserve and showcase an exceptional finish.”- usmint.gov

bombay hook quarter proof value
Why Proof Coins Are More Valuable

“Proof coins have a higher relative mark-up than uncirculated coins.  Furthermore, proofs sell for more than face value as collector’s items.  However, they cost more than uncirculated coins to purchase.”  That’s why it’s uncommon to find them in circulation.

Moreover, proof coin production moved from Philadelphia to San Francisco in 1968.  It’s where all proof coins gain the “S” mint mark. Proofs subsequently made at West Point carry the “W” mint mark.

are proof coins in circulation
Proof Coins are Collectibles

The S mint mark is meant as collectors coins  However sometimes proof coins wind up in circulation.  Kudos to their finders!  An impaired proof  “ is a proof coin that grades less than PR-60; a circulated proof.” – coins.thefuntimesguide.com

“Because of the extra effort, time, labor and production costs in making a proof coin, the respective government mints often sell them at higher prices.  The end result is that usually, but not always, a proof coin of the same date will be more expensive than a non-proof uncirculated.”

2015 bombay hook proof quarter value

Furthermore, observe the sold listings of 2015-s Bombay Hook Delaware quarters on Ebay to get an idea of current mark value.  Keep an eye for listings on Amazon.com as well.  Furthermore, get a coin scale to weigh all your coins.  Error coins don’t weigh like their supposed to and silver weighs more than clad.

For instance, clad quarters weigh 5.6 grams, whereas silver quarters weigh 6.25 grams.  Silver quarters are worth more regardless of condition because of their metal content. 

2015 S Bombay Hook Delaware Quarter Values

2015 S Bombay Hook Deleware quarter values vary, depending on the condition and designation the coin receives. For instance, a 2015-S 25C Bombay Hook quarter graded PR70DCAM, sold for $31.00.

Furthermore, a 2015-S 25C Delaware national park silver quarter graded PR70DCAM, sold for $45.00.  Additionally, a 2015-S 25C Bombay Hook NP designated “First Strike,” DCAM (Proof) graded PR70DCAM, sold for $27.00.   Moreover, a 2015-S Delaware quarter graded MS68, sold for $300.00.

Proof coins make great gifts for holidays and birthdays.  Check out a 2003 Maine proof quarter struck through string error and learn about “Proof-like” coins!

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.