Watch List notes:

BRITISH COINS, Charles I, Silver Shilling, Tower mint under the King (1625-1642), type 3a, crowned bust left, value behind, no inner circle, initial mark bell (1634-1635) both sides, rev quartered oval shield of arms with garnish, no inner circle, 5.78g (N 2225; S 2791). Flan a little ragged at edges with light surface marks on the obverse, otherwise fine, reverse better, lightly toned.
from the David Sellwood collection

Estimate: £150-200