Countermarked issues, Fourpence-Halfpenny, an Edward VI, Second period, First issue, Shilling, mdxlix, Canterbury, mm. rose on rev. only, bust 3, transposed legends, obv. with portcullis countermark, 3.16g/10h (N 1989; S 2546).  Extremely rare.  Ex Dr John Hulett, Provenance: SNC June 1994 (4136).  Images courtesy of DNW.