THAILAND. Mint Error -- Struck on Silver Planchet -- 12000 Baht, BE 2549 (2006). PCGS MS-64.
cf. KM-Y-494. Struck to commemorate the 60th anniversary of the reign of King Rama IX. Struck in silver instead of the intended gold composition. Mostly white with a few toning spots appearing on both sides.
Estimate: $400 - $600