Watch List notes:

Halfcrown 1666 the 6 overstruck, probably over an 8 (see footnote in 1992 ESC regarding Harrington Manville's opinions on this overdate) Elephant below bust ESC 462 VG/Fine nicely toned and of even appearance, pleasing for the grade, a collectable example of this very rare type, rated R3 by ESC: Collectors note:- there has been speculation over the underlying date figure for many years, and based on the evidence of this coin, there is strong evidence of the last figure being over an 8 as the lower loop and part of the upper loop of the underlying digit are clearly visible, an important coin

Estimate: 900-1200 GBP