Watch List notes:

Richard II (1377-99), Groat, Tower, type III/II mule, 4.52g, 7h, m.m. cross pattée, 'fishtail' lettering, reads di and franc, fleurs on cusps, double saltire stops, lombardic ns, rev. 'new' lettering, double saltire stops, normal barred ns (Potter III-1/IIf; BNJ XXIX, pp. 351, this coin listed; N.1321a/1320b; S.1680/1679), the reverse off-centre and softly-struck to periphery, fine/good fine, very rare.
provenance
C Rochester, Spink 194, 27 March 2008, lot 529 [with his ticket, stating: acqured, 8 September 1999 - £465]
W J W Potter, collection part-purchased by Seaby, 1962, the remainder sold to Spink, Seaby and Baldwin, c. 1970-71
Estimate: £400 - £500