Watch List notes:

BRITISH COINS, Charles I (1625-1649), Silver "Fine Work" Shilling, Tower mint, group D, type 3b, fourth crowned bust in lace collar left, value behind, .CAROLVS. D; G; MAG; BR; FR; ET. HIB; REX., initial mark bell (1634-1635) both sides, rev plumes over oval quartered shield of arms, legend continuous under shield, .CHRISTO. AVSPCE. REGNO. with IS struck over ST and no I in second word, 6.03g (Brooker 491A/-; Sharp E2/3; N 2226; S 2793). A few light flecks and spots, small short scratch to right of reverse plume, underlying brilliance, good very fine, toned and very rare.
ex Spink Numismatic Circular, December 2008, HS3676, featured on the front cover
A similar coin was sold in the famous Slaney Collection (part one) but this had the more usual reverse die with the correct spelling for AVSPICE and not continuous under the shield.

Estimate: £3000-3500