Strike-Through Looks Dramatic
By Ken Potter
reader David Hiddleson of Iowa sent in a very
nice example of a 2000-P Sacagawea dollar with a
Strike-Through error. In this case the coin is
struck through what I like to call "Mint Goop."
Debris, (which can build up around machinery),
made up of grease, oil, metal filings, etc., may
work itself into and cover the dies. When this
occurs it can fill certain areas of design and
prevent those areas from being struck up on the
coins the dies are striking.
In this case we can see that the obverse was the
recipient of most of this activity and that the
areas closest to the rim where the goop first
enters the dies is the most affected. IN and WE
of IN GOD WE TRUST, the entire word LIBERTY that
is normally positioned about the upper rim and
the final "0" of the date are missing. We can
also see that the goop oozed in even further to
affect major areas of the central design.
The reverse got covered with a thin layer near
the rim affecting portions of some of the
letters closest to the rim but not too
dramatically. Other than that, the reverse is
very well struck. Filled die errors (which these
are often called) range from minor examples to
majors with values ranging from just a few cents
over face value to hundreds of dollars,
depending in the severity and coin type
effected. Generally, ones like this are
considered fairly major.
While we are on the topic of Strike-Through
errors we might just as well look at a few
others that do not involve mint goop. Suzanne
Stewart of Virginia sent in several examples.
Another type of Strike-Through error that we see
a lot of are the Struck-Through-Lint errors
found on proof coins. Because the dies used to
strike proof coins are routinely wiped clean
with a rag from time to time, there is an
opportunity for lint to be left behind on the
This is what happened with both her 2008-S clad
Hawaiian quarter and her 1999-S clad proof
Kennedy half. These are generally minor and do
not attract much attention from error
collectors, but are nonetheless, fun to find.
A note of caution: this type of error does not
add value to a scarcer date proof coin. It
actually can detract from its value. For
example, if this 1999-S half was of the more
valuable silver version, many folks would avoid
buying it at full value and it might only be
able to be sold at a discount.
Stewart's final coin is a 2006-P South Dakota
state quarter with matte finish from out of the
government issued Mint Set. It shows at least
four noticeable flecks of copper struck into the
surface of the reverse. These copper flecks may
have fallen away from struck coins that had
finning on them as was described in my March 17
Numismatic News article, "Dime struck through
Whatever the source of the copper flecks, the
end result is very interesting and undoubtedly
adds some value to the coin as an error.