Watch List notes:

BRITISH COINS, Tower mint, Halfcrown, Gp III, mm. triangle (over anchor, flukes to left on rev.), sash flies from waist, rev. bird-headed harp, 14.65g/6h (cf. Bull 361/23; Brooker 348ff; N 2209; S 2773). Fine, reverse better £100-150

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The reverse die occurs with a Briot obverse