Watch List notes:

GREAT BRITAIN. Mint Error -- Double-Struck Rotation -- 1/2 Crown, 1817. George III. PCGS EF-45 Gold Shield.
S-3789; KM-672. A very pleasing error and quite scarcely seen on larger denominations. The surfaces are quite nice aside from the expected circulation wear and the 90 degree rotation and double strike is quite dramatic, creating an almost Janus-like portrait.

Estimate: $600.00- $900.00