The period 1965 to 1967 was an interesting time in US numismatic history. The price of silver had risen to the point where it made no sense to make higher denomination coins out of silver. In addition, there was a widely reported coin shortage, despite record production levels.

As the mint scrambled to adjust, a number of emergency measures were taken. Production of 1964-dated coinage continued well into 1965 until the new clad planchets were ready. Then, to make sure that there was enough of the new coinage to go around, the mint decided both to cease production of proof coinage and to do away with mintmarks. The only concession of any kind made to coin collectors were the Special Mint Sets of 1965-67, not true proof coins, but high quality circulation strike coins similar in some ways to the satin finish coins in mint sets today.

In 1968, the mint resumed the use of mintmarks and the production of proof coinage, but with a new twist. Proof coins, like the prior Special Mint Set coins, were now made in San Francisco, and the S mintmark reappeared after a 12 year hiatus. Initially, the San Francisco Mint also manufactured some circulation strike cents and nickels, but their dimes, quarters, and halves were strictly proofs. The mint would eventually also make Susan B. Anthony dollars for circulation, as well as silver-clad Ike dollars and bicentennial coinage for collectors.

During the first year of S-mint proof set production, an unexpected hitch occurred. In a few sets full of S-mint coins, the dimes had no trace of a mintmark! This came about because at that time all coinage dies were prepared with no mintmark, which would be added only upon arrival at the branch mint. On one die, that didn’t happen, and an instant rarity was made.

Walter Breen opined that about six examples of the 1968 no S dime were known. If that is true, then Heritage has sold each of these coins an average of at least three times apiece. Nevertheless, the 1968 no S dime is clearly an extremely rare coin, likely R.6 or low R.7, surpassed in rarity among 20th century dimes by only one coin.

Heritage’s upcoming 2010 April-May Milwaukee, WI CSNS US Coin Auction includes a rather unique proof set: one each of the five collectible missing mintmark proof coins. Along with the 1968 no S dime, the set includes the 1970 no S dime, the 1971 no S nickel, the 1983 no S dime, and the 1990 no S cent. While none of these coins is as rare as the 1968 S-less dime, each is highly desirable, and a key to its respective proof series. All of the coins in the set grade Proof-68 or 69, and show the eye appeal expected of latter-day US Mint products.

Incidentally, the sole 20th century dime that is rarer than the 1968 no S proof dime is also an S-less proof. A mere two examples are known of the 1975 no S dime, and neither Heritage nor the major grading services has ever handled one!

NGC recently authenticated a 2009 D Zachary Taylor Presidential $1 coin bearing the date 2010 D on its lettered edge.

NGC has certified a Zachary Taylor Presidential $1 coin that bears the date 2010 D. The Zachary Taylor coin was the fourth Presidential dollar released in 2009 and should correctly bear the date 2009, not 2010. This is the first time that the wrong date has been reported on an edge-lettered US dollar.

The date on each Presidential $1 coin appears on its edge and is applied by an edge lettering die after the obverse and reverse are struck with a blank collar. Because edge lettering is an additional and subsequent step, it has been the source of several types of novel mint error coins. Most common among these errors is partial edge lettering, which occurs when a coin gets hung up in the edge lettering machine and part of the edge lettering is not impressed. Another error is missing edge lettering; that error occurs when a coin misses the edge lettering step entirely. A third error type that has been encountered is doubled edge lettering, which is created when a coin passes through the edge lettering machine twice.

While there are many possible explanations for how this incorrect date error may have occurred, its story is seemingly revealed by the coins that accompanied it. This error coin was included in a roll of 2010 D Native American $1 Coins that were purchased using the US Mint’s Direct Ship Program. Since only this lone Zachary Taylor $1 was found in the roll, one can speculate that the same machinery was used to strike 2010 D Native American dollars after completing a run of 2009 D Zachary Taylor dollars. A coin was left behind somewhere between striking and edge lettering became mixed with Native American dollars headed for the edge lettering process, and was thus inscribed with the wrong date.

Because of where this coin was found, it does not suggest that a large run of error coins were made and, therefore, this type of error coin may remain a significant rarity. (more…)

By Ken Potter

By way of introduction, I am an error and variety coin specialist from Michigan. As a charter life member of the Combined Organizations of Numismatic Error Collectors of America (CONECA) and a founding member of the National Collector’s Association of Die Doubling (NCADD), I serve both groups independently as their official attributor of world (non-U.S.) hub doubled dies and I privately list all types of die varieties on both U.S. and other world coins in the Variety Coin Register(r). I am also a columnist for Coin World, World Coin News, Canadian Coin News, Cherrypickers’ News and several club publications.

While I plan to examine issues other than errors and varieties, most of what I plan for this column will relate to my area of expertise. Before getting started I should mention that varieties listed within the Variety Coin Register(r) (VCR) are assigned a primary VCR number and a secondary number that defines the variety type or class. This reference number will accompany the description for most varieties shown in this column. I believe the system is rather self- explanatory but if anybody desires a detailed explanation they may contact me via e-mail and request “Form#VCR”.

Another item in need of explanation is how I differentiate between errors and varieties. The lines of demarcation are not always clear and tend to vary between specialists. One area of agreement is that any mechanically misstruck coin or a coin struck on an improperly prepared planchet is an error coin. It is also a consensus that any coin displaying a deliberate change in design is considered a “die variety”. Thus a coin struck “off-center” or “struck on a damaged planchet” is considered and “error” while a coin exhibiting a change in the style of lettering, etc., is considered a deliberate “variety”.

Some specialists argue that certain “varieties” such as repunched Mint marks (RPMs) and hub doubled dies are actually “errors” because there is no intent by the Mint to prepare a “flawed” die. Others argue many RPMs and doubled dies are more appropriately defined as a “variety”; they believe they’re deliberately released and contend that many issuing authorities consider such flaws trivial and an expected byproduct of tolerances and processes in place (a stance with which I pretty much agree).

It is also known that some “overdates” were deliberately created by the Mint to extend the life of an otherwise obsolete die, while it is presumed that others were created in error. While most specialists agree, determining which dies were deliberately overdated and which were not is often an exercise in futility. Thus we cannot know for certain if we can accurately apply the term “error” to many “overdates”. (more…)