William III, 1697 Halfcrown, edge error REGN.NI:
Obverse: GVLIELMVS. III.DEI.GRA. , laureate and draped bust of William III facing right:
Reverse: 97.MAG BR.FRA ET.HIB REX.16 , four crowned cruciform shields, large shields, all around central lion of Nassau, ordinary harp.
Edge: DECVS.ET.TVTAMEN..ANNO.REGN.NI.NONO.+.+.+.

Obviously seen a lot of circulation though a clear and presumably very rare edge error.

Sold 2013