Presidential Error Coins: John Adams Dollar Coin
Posted on 6/13/2007
Just like the Washington $1 coins, the John Adams dollar coins show an abundance of edge lettering errors. The first errors to surface for this issue were doubled edge lettered coins. This error occurs when a coin passes through the edge lettering machine twice. These come in two variations which are recognized by NGC:
Doubled edge lettering with the second set of letters overlapping the first (in various degrees from close to far). Because of space considerations, this is described on the NGC certification label as DBL.EDG.LET. – OVERLAPPED.
Doubled edge lettering with the second set of letters inverted over the first. On inverted examples, the two sets of edge lettering are in opposite orientation. One faces up when the obverse side is up, and the other is upside down. This is described on the NGC certification label as DBL.EDG.LET. – INVERTED.
Since these coins are fed through the edge lettering machine at random orientation, the edge lettering will appear randomly (as will the doubling) on the edge of the coins. This explains why some of the doubled edge lettering is overlapping and some inverted.
Here are some photos of doubled edge lettering. Again, the variety of positioning and orientation of the letters is essentially limitless.
|Left: Obverse with exploded edge view of 2007 P John Adams $1, showing overlapped doubled edge lettering.
Right: Close up of overlapped doubled edge lettering. Click images to enlarge.
|Left: Obverse with exploded edge view of 2007 P John Adams $1, showing inverted doubled edge lettering.
Right: Close up of edge, showing the inverted doubled edge lettering. Click images to enlarge.
Another error that we have seen occurs when a coin has missed the edge lettering process entirely, and therefore has a blank edge. NGC certifies this Mint Error as MISSING EDGE LETTERING.
|Left: (2007) John Adams $1 obverse, with exploded edge view.
Right: Close up of the blank edge. Click images to enlarge.
Error in Dies
With the Washington dollars, we saw some of the errors that exist for virtually every modern coin type. These include errors such as filled dies and rotated dies. Dirt, grease or other material can adhere to the die during minting. The filled portion of the die does not impart detail to the struck coin. Errors of this type are labeled as OBV STRUCK THRU.
Rotated dies can be either minor (within mint tolerance) or major. This error occurs when the die turns during striking or when the dies is inserted improperly into the coinage press. The Adams dollars has been found with varying degrees of rotation unlike the Washington where, to date, only one variation has been seen.
For some examples on the John Adams dollar, this rotation resulted in “medallic” alignment versus the correct, “coin” alignment. Medallic alignment occurs then the dies are rotated a full 180 degrees. The illustration below shows various types of alignment. NGC will designate rotated dies when the rotation is equal to or greater than 15 degrees.
causing a significant loss of design. Click image to enlarge.
This illustration describes various type of rotation. Click image to enlarge.
This next coin is new to the series. On this coin, the edge lettering die seems to have been inadvertently laser-etched, making the entire edge of the coin appear frosted or matte-like. At first glance, without putting a loop to the coin, the edge appears simply less shiny than normal coins. Magnification of the edge of the coin reveals the lines associated with laser etching. While NGC is not recognizing this the matte edge John Adams $1 coin at this time, we are currently investigating it for attribution.
John Adams dollar displaying “matte” edge. Click image to enlarge.
The regular coin appears at type, and the frosted version at bottom. Click image to enlarge.
suggesting laser etching. Click image to enlarge.
Stay tuned for updates and NGC articles on other coins in this series.
Want to know how much is a John Adams $1 coin worth? See the coin's value on NGC Price Guide.
Check out our content across all our companies like this guide to the rarest and most expensive Pokémon cards in the world.
Want news like this delivered to your inbox once a month? Subscribe to the free NGC eNewsletter today!