Watch List notes:

The Isladulcie Collection | Richard II (1377-1399), Halfgroat, Post-Treaty/Type III mule, Tower, + EDWARDVS REX ANGL Z FRANC, saltire stops, lombardic Ns, rev. + POSVI DEVM ADIVTOREM MEV', saltire stops, CIVITAS LONDON, reverse-barred Ns, 1.91g, 5h, m.m. cross pattée (DIG PT6/1-ii; LAL obverse 21; Potter III-9/IIIa; Doubleday 659, same obverse die; Stewartby IV, 1197, same obverse die; North 1324 [1290/1323]; Spink 1684 [1640A/1683]), same dies as last, slightly short of flan, otherwise good fine, rare.
provenance
Clarendon, part I, Bonhams, 28 March 2006, lot 443 - £500 [this ticket notes only 5 examples known, 3 in institutions, the Stewartby collection, and this coin. This corpus should be reviewed in light of recent auction dispersals]
Estimate: £180 - £220