France
Republic copper-nickel Essai 100 Francs 19XX MS64 NGC, Paris mint, Maz-2531D. Splendid strike with a bit of frostiness, some contrast from the fields and faint light silvery amber tone. An example recently sold in the e-Monnaies December 2015 auction for $569 without the buyers premium.
Estimate: 600-800 USD