Watch List notes:

The L'Abbaye Collection | Charles II (1660-1685), Mule 'Plume' Shilling, 1674, second bust, plain below, rev. six strings to harp, plume in centre, edge obliquely milled, 5.86g, 6h (Durlacher 350; Parsons 551b; Bull 528 [R4]; ESC 1041; Pywell-Phillips -; Spink 3377), rubbed surfaces, otherwise a bolder fine, extremely rare, only five traced with certainty by this cataloguer and this one of the finest.
Provenance
SJA 3, 3 October 2005, lot 323 - £1,100
Possibly
SCMB, August 1953, no. 6558 - 'Probably the rarest of the Shillings of this reign, nearly VF, RRR - £16.0.0'
,
Estimate: £1200 - £1500