Fat Lettering is the result of Die Deterioration.
A similar example is seen on the 1999 January 25c:
http://www.coinscan.com/mill/j99.html
Pat Glassford doesn't have a listing for Fat Lettering on the October 1999 coin - you might want to let him know what you've found. I'm not sure if he is still updating the Millennium section of his website.
http://www.coinscan.com/mill/o99.html
A similar example is seen on the 1999 January 25c:
http://www.coinscan.com/mill/j99.html
Pat Glassford doesn't have a listing for Fat Lettering on the October 1999 coin - you might want to let him know what you've found. I'm not sure if he is still updating the Millennium section of his website.
http://www.coinscan.com/mill/o99.html
























