The $50 gold coin that became a $500,000 rarity
A gold pattern Chinese coin picturing Chang Tso Lin (1875-1928) was dubbed 'one of the rarest coins in the world' by A.H. Baldwin & Sons and Ma Tak Wo Numismatic Co Ltd who offered it for sale in Hong Kong on August 28.
Chang Tso Lin was warlord of Manchuria from 1916 to 1928 and at one time ruled an enormous area of n…