In fact, no single Bactrian coin has ever caused such a stir as his great gold masterpiece. This massive 20-stater coin is of the standard Eucratides type, with portrait of the king on the obverse wearing a commander's cloak, a royal diadem and a great plumed helmet decorated with the ears and horns of a bull. The reverse offers the king's usual type, two mounted horsemen—the heavenly twins, the Dioscuri of Greek legend—charging to the right. Eucratides's usual titles appear on the coin as well. It is not the style, exceptionally fine though it is, which makes this, in the words of one expert, "the rarest coin in the world"; it is the extraordinary size. At 63 millimeters in diameter (2½ inches) and more than 169 grams (six ounces) of Bactrian gold, it is the largest such coin ever minted in the ancient world, apparently to celebrate the king's conquest of Demetrius of India. There is only one specimen known in the world today—but that such a huge coin could escape the melting pot at all is amazing luck for us.
The unusual story of this coin's discovery can be tracked down through various newspaper accounts from over a century ago. In June of 1867, a French numismatist associated with the British Museum was dining with a group of collectors in London. One of the guests told about a strange encounter he had had that day with a shabby beggar trying to sell an ancient coin. He described a gold piece so large that all at the table agreed it must be a forgery. Yet, as the conversation drifted to other numismatic topics, the French expert could not get the gold coin out of his mind. Finally, in what he called "a fit of numismatic fever," he excused himself and set out to follow the trail of the beggar. When the two finally met late one night in a ramshackle London flat, the expert demanded to see the coin at once. The beggar explained that he had come all the way from Bukhara, where he and six others had found the coin. In a matter of minutes, he said, daggers were drawn and five of the men were dead. The two survivors agreed to smuggle the prize to Europe and share whatever price it brought. Then, his story told, the mysterious fellow took off his old coat, his shirt and his undershirt; he lifted his arm and pulled from his armpit a filthy, sweaty leather case with the gold coin sewn inside.
With an "electric shock," the numismatist held the coin and convinced himself that it was no forgery—but he knew that he must conceal his enthusiasm as he bargained down the price. The traveler from Bukhara insisted upon £5000 for the giant coin; the expert handed it back and wrote a check ... for £1000, adding coolly that this was his offer for the next 20 minutes. After that, he said, "I'll give you only £800, and so on until I get to £500. If you don't close the deal tonight, tomorrow I will not take the coin at any price."
They stared at each other for more than 19 minutes. Then the beggar snatched the check for £1000, and handed over the coin.' "This," reported the numismatist to the new papers, "is the rarest coin in the world, and the one for which the highest price has been paid. Since it cost the lives of five men, I do not think anything more was paid for it than it was really worth. It ought to have been saved for the delectation of numismatic amateurs in all times to come, even had fifty or one hundred lives been sacrificed."
If you have in mind some numismatic delectation of your own, however, do not ask to see the coin at the British Museum. Though associated with that great institution, the buyer was a Frenchman first of all. Through the special attentions of Emperor Louis-Napoléon, the 20-stater gold piece of Eucratides was immediately purchased by the Bibliothèque Impériale, now the Bibliothèque Nationale, in Paris.
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