Watch List notes:

Victoria (1837-1901), Proof Halfcrown, type A1, 1864, young head left, one ornate and one plain fillet, w. w. in relief on truncation, rev. en médaille, crowned shield in wreath, eight strings to harp, edge plain, 15.18g (ESC 2740 [R2] {691}; S.3888), an inconsequential rim bruise at reverse 2 o'clock, and light cabinet friction across otherwise brilliant surfaces, extremely fine, the reverse better, very rare.
provenance
Purchased Spink, July 2006 (via M Rasmussen)
Estimate: £5000 - £6000