Watch List notes:

(x) Hiberno-Norse Vikings of York, St. Peter coinage (c.905-927), Halfpenny, 0.47g, two-line type, York, sci petrm in two lines, three pellets between, rev. +edorace civ, small cross pattée in inner circle (N.554; S.1008), slightly porous surfaces, very fine, extremely rare.
Provenance:
LaRiviere, Spink auction 160, 9 October 2002, lot 988

Only one other specimen of this Halfpenny has appeared at auction in the last sixty years, a large fragment in the Norweb Collection (lot 39).
Estimate: £2,000 - £3,000