Watch List notes:

BRITISH COINS, Oliver Cromwell, sixpence, 1658, Dutch, or Tanner's, cast copy, laur & dr. bust l., Liberty cap below, rev. crowned shield of arms, inverted die axis, wt. 4.13gms. (cf. ESC.1506), very fine, exceedingly rare.
The Liberty cap was an emblem of political freedom in the Netherlands.

Estimate: £2000-2500