Watch List notes:

The Lost Collection of Simon English Esq. | Edward VI (1547-1553), Third Period, Gold Halfcrown or 'Half-Quarter' (Eighth of a) Sovereign, Tower, (m.m.) EDVVARD '. VI • D '. G '. A '. FR '. Z • hIB .' REX •, lozenge stops, half-length figure of King right, holding orb and sceptre, rev. (m.m.) SCVTVM • FIDEI • PROTEGE • EVM, crowned square-topped shield dividing E-R, 1.45g [22.3grns], 2h, m.m. tun (Tyssen 1660(c); Montagu I, 813 = Murdoch I, 489 same dies; HCN 68 = AHH Virtual 56 this coin; Ryan 255 = Schneider I, 699 same dies; North 1930; Spink 2453), on a bright and irregular flan with traces of doubling, otherwise handsomely uniform and especially boldly for type, almost extremely fine, of the highest rarity, presumed the finest of the five known.
Provenance
The Lost Collection of Simon English Esq.
Alderman Hird, Sotheby's, March 1988, lot 699 - £2,600 [with his envelope and ticket]
Lockett, Part II, Glendining, 11-17 October 1956, lot 1880* - in beautiful state for this excessively rare coin - £125.0.0
Virgil Brand, collection part-purchased by Baldwin, 1935
Estimate: £6000 - £10000