The following is a 60% off-center example of J151/P17.
Its earliest recorded appearance was in Bluestone's 6/1940 sale where it was described as follows:
This piece reappeared in ANR's March 2005 sale and later in Heritage's January 2006 FUN and 2006 ANA sales.
This is probably one of the most spectacular pattern mint errors known today.
Photo courtesy of American Numismatic Rarities. Snippet from Bluestone's June 1940 sale is from the Newman portal.