Watch List notes:

Great Britain. Octagonally countermarked Spanish dollar or 8 Reales. S.3766; KM-656. Spanish 8 Reales bearing the portrait of Charles IV, overstruck with an octagonal counterstamp featuring the head of George III. Reverse; Crowned arms of Spain within two pillars. Little sign of circulation on this high quality piece. PCGS graded AU-53, Countermark graded AU Detail. Estimate Value $1,600 - 1,800
* The octagonal counterstamp is many times rarer than the oval counterstamp, and especially so in high grade.