The 1856 British Guiana 1-cent black-on-magenta stamp has been described as the most valuable stamp in the world. It brought $9.5 million at a June 17 auction. What’s the upper-limit for the rare coin market?
Ten million doesn’t buy as much as it used to in some collecting areas, but in the rare coin market, a new $10 million buyer could have a dramatic impact on the entire market. Or, he or she could buy a single absolutely extraordinary coin.