This is a unique Major Mint Error from the famous Bolt Collection that was sold thirty years ago. All major mint errors on proof patterns are very rare. Considering that this is also from the 3¢ Silver series makes this unique piece even more exciting.
It is a proof striking on a Silver planchet. It is Judd #125 Original, Pollock #147 Rarity-4. ANACS authenticated and certified this mint error as a Capped Die and graded it Proof 60.
The obverse is uniface and the design was distorted since it was struck against a blank planchet. A fantastic and dramatic mint error on a 3¢ Silver Pattern.