Brazil
Republic gold 10000 Reis 1914, KM496, Russo-705, AU Details - Repaired, Cleaned NGC. Mintage: 969. An imperfect example, but incredibly rare with a scant mintage under 1,000, and survivors likely numbering no more than a dozen. A scan of major sales yields a single example, graded as Superb, that sold in November 1987 Sotheby's auction for the astounding hammer price of 18,700 Swiss Francs.
Estimate: 3500-4500 USD