Elizabeth I, half angel, third issue, mint mark coronet (1567-70) St. 1992/1; Schneider -; Brown and Comber D3, this coin. Christie's, 26 2 1981, lot 601.
This is one of only two known examples, thus is excessively rare. It has been slabbed by NGC AU53'TOP POP'. A superb rarity with an exceptional provenance having been in numerous illustrious collections.