Watch List notes:

(x) Vikings of York, Siefred (c.895-920), Ebraice Civitas series, Penny, 1.38g, blundered legend, +sie c rt re (for 'sievert rex'), patriarchal cross, rev. +d. ns. ds. rex., small cross pattée in inner circle with pellets in two angles (N.506; S.982), slightly wavy flan, small test punch in obverse field, very fine with some lustre, rare.
Provenance:
Spink Numismatic Circular, December 1991, no. 7960
Estimate: £600 - £800