France
Republic aluminum Piefort Essai Proof 25 Centimes 1909, Maz-2289, PF63 Matte NGC. See Auction 10 of November 2011, Lot 551 of Maison Palombo. There, a similar piece, listed as exceedingly rare, sold for 6400 Swiss Francs plus buyer's fees. Ex-Dupuis Family Holdings.
Estimate: 1500-2000 USD