Check the listing for details. England - 1698 William III - Pattern Proof Silver Farthing - PCGS AU Details. Listed at 1450.00 USD. This rare 1698 William III Proof Silver Pattern Farthing is a must-have for any serious coin collector. Made of 0.9 fineness silver and highly desirable as a unique proof pattern, this farthing is a truly special coin. Denominated as 1/4p and minted in England, this coin is a piece of history that you won't want to miss out on. Certified by PCGS as AU details "Damaged" this Farthing has been unfairly graded as such as the damage in question is meerly a impact mark in the field by the leg of Brittania. This mark should be considered normal for a piece of this age and should detract from the value of this rare coin.. Don't miss your chance to own a piece of United Kingdom's rich history through a rarely offered pattern piece. Add this stunning Silver Farthing to your collection today! PCGS AU Details.