James I, third coinage, Halfcrown, m.m. thistle over rose, king on horseback right, groundline below, rev. square garnished shield (N.2122; S.2666), good fine and an extremely rare overmark

The obverse of this piece is struck from the same die as Seaby, SCMB May 1970, no. DC59 m.m. rose, with m.m. thistle punched over the rose and a groundline added below the horse. The reverse is from the same die as Spink, SNC September 1989, no. 4688 m.m. rose, with m.m. thistle punched over the rose.