Hong Kong
British Colony. Elizabeth II Double Obverse Mint Error Dollar ND (1978-1980) MS65 PCGS, KM43. Very rare and peculiar as a genuine "double headed" coin, and especially lustrous in this Gem condition. Compare to a similar 5 Dollar piece which sold in Heritage Hong Kong sale 3047, lot 29414, which brought a hammer of $2,400 in a PCGS AU53 holder.
Estimate: 1000-1500 USD