Watch List notes:

BRITISH COINS, Charles I, Silver Halfpound, 1642, Oxford mint (1642-1646), king on horseback left with upright sword, flowing sash, horse over arms and militaria, Oxford plume in field, legend and borders surrounding with colon stops, initial mark plume (1642-1646), rev initial mark seven pellets, declaration in two straight lines, value and three Oxford plumes above, date below, colon stops in legend, 58.92g (Brooker 868; N 2404; S 2945). A little weakly struck in parts with some surface flaws and striations in places, otherwise bold fine on a good regular flan.
from the David Sellwood collection

Estimate: £800-1000