1851-O Silver Three-Cent Piece. MS-65 (PCGS). CAC.;Charming silver gray surfaces are framed in warm reddish-orange peripheral toning. Smooth and satiny, this is a solidly graded and attractive Gem. Popular with collectors as the only mintmarked issue in the silver three-cent series, the 1851-O is also a conditionally challenging issue that is seldom offered with the superior quality that defines this piece.