France
Republic gold Nine-Piece Proof Piefort Set 1977, 1) Centime - PR67 Ultra Cameo NGC, KM-P5682) 5 Centimes - PR68 Ultra Cameo NGC, KM-P5713) 10 Centimes - PR69 Ultra Cameo NGC, KM-P5744) 20 Centimes - PR67 Ultra Cameo NGC, KM-P5775) 1/2 Franc - PR67 NGC, KM-P5806) Franc - PR69 NGC, KM-P5837) 5 Francs - PR69 NGC, KM-P5868) 10 Francs - PR67 NGC, KM-P5899) 50 Francs - PR67 Ultra Cameo NGC, KM-P592Impressively preserved and extremely rare as a set, with individual mintages for each coin ranging from 32 pieces to 53 pieces. Essentially never seen together as a full set.
Estimate: 15000-20000 USD