Watch List notes:

BRITISH COINS, Richard II (1377-1399), Halfgroat, type IV/Henry IV mule, London, crescent on breast, wedge-shaped contraction after angl, v-shaped stops after ricard, dei and gra, rev. unbarred ns in london, 2.01g/1h (UKDFD 31762; DIG IV, 3/Heavy, 3ii; Potter –; N 1323/1346; S 1685/1718). Surfaces porous, good fine, excessively rare; the third known specimen and a unique pairing of dies £800-1,000