Even though, by their own definition, modern coins are relatively new, they can still develop many of the same problems that older coins do.
Even though, by their own definition, modern coins
are relatively new, they can still develop many of the
same problems that older coins do. Among the list of
commonly encountered problems are spotting, hazing,
unattractive toning, PVC residue and improper dipping.
In some cases these various problems can cover the entire
surface of a coin leaving it unable to be accurately
graded. These problems often originate from being stored
under humid conditions or in potentially harmful containers.
No matter how slight these contaminations may be, they
will still have an affect on the final grade of your
coin. They can occur even in the original Mint sealed
packaging. Recently it was reported that the U.S.
Mint was planning to sell off a large parcel of older
proof sets. Because it was determined that significant
portions of the sets were spotted, they were ultimately
Proper conservation techniques such as those used by
the Numismatic Conservation Service (NCS) can
remove most or all of these types of contamination as
well as many other types. It is not at all uncommon
for a modern coin that would grade 67 or 68 (Mint State
or Proof) due to these various problems, to grade 69
or even 70 after proper conservation. It is also extremely
important to remember that several of these contaminants
will continue to get worse and possibly damage the surface
of the coin over time. NCS has spent numerous hours
developing the best methods for conserving the various
coins that they encounter. Please note that certain
types of problems cannot be addressed through professional
conservation. In these cases, surface damage has occurred
which cannot be reversed.
If you currently have coins that have been affected
by any of the problems listed above or any other problems,
you can send your coins to NCS for conservation and
then have the coins submitted directly to NGC for grading.
If you have any further questions about rare coin conservation,
feel free to contact NCS toll-free at 1.866.NCS.COIN.