Monaco
Charles III gold Proof Essai 10 Francs 1966-(A) PR67 Ultra Cameo NGC, Paris mint, KM-E57. A flashy example of this off-metal strike that commemorates the 100th anniversary of the accession of Charles III with slightly hazy, mirrored fields that produce a lovely cameo effect upon the frosty devices. Scarce, with a mintage of just 1,000 pieces.
Estimate: 2000-2500 USD