Watch List notes:

Charles I (1625-49), Halfcrown, Briot's first milled issue, 14.91g, m.m. flower and b, armoured King on horseback left, holding sword upright, ground below, rev., small b above crowned oval-garnished shield, dividing crowned cypher (N.2299; S.2853), attractively toned, good very fine, scarce.
provenance
Gray collection
Spink Numismatic Circular, May 1989, no. 2563 (illus.) - £425
Westminster School collection, Sotheby, 26-27 May 1976, lot 422
Estimate: £1200 - £1500