Watch List notes:

BRITISH COINS, York mint, Halfcrown [type 4], mm. lion, ebor below horse, pellet stops both sides, 12.72g/6h (Bull 573; Besly pl. 8, 7; SCBI Brooker 1080; N 2312; S 2866). About very fine £150-200

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Generally thought to be a contemporary forgery in base silver. However it may perhaps have been officially machine made at the mint at a period when there was a shortage of specie