France
Napoleon III gold 100 Francs 1856-A MS63 NGC, Paris mint, KM786.1, Mintage: 57,000. Glossy reflectivity accompanies the fields and the central devices hold delicate frost, the combination producing a delightful cameo effect on both sides. One of only three examples to be graded MS63 at NGC, with a single coin receiving a higher grade. Rare and desirable thus.
Estimate: 4000-5000 USD