France, 1874

Forex appears very problematic, if currency prices are meant. Assume ℳ 1. = Fr. 1.25
1874: 1 Ozt. Platinum (Germany: Mfg, Bulk) ~ Fr 32.54  (ℳ 26.033)

1874:

Platinum Scrap (Bid), Fr. 600-700./Kg.  

Platinum Ingot (Mkt), Fr. 900./Kg. 

Platinum Producer Spot, Fr. 950./Kg.

Platinum (Semi-Mfg), Fr. 1,000./Kg.

Platinum Still, Fr. 1,050./Kg.

Platinum Intrinsic Retail, Fr. 1,325./Kg. 

Platinum Sheet Retail, Fr. 1,475./Kg. 

Platinum Mfg Retail, Fr. 1,575./Kg.

Platinum Mfg Specialty, Fr. 1,725./Kg.

1873: 1 Troy Oz. Platinum (Paris: Mfg, bulk) Fr 32.66 ($ 6.16; USD$ 7.2353)

1874: 1 Troy Oz. Platinum (Paris: Mfg, bulk) Fr 32.66 ($ 6.14; USD$ 6.83)

Citation: Le Moniteur scientifique du Doctor Quesneville: Journal ..., Vol. 39-40 G. A. Quesneville, p.664

1874: 1 Troy Oz. platina (Ore, Retail) = Fr 25.19 (USD$ 5.27)

1874: 1 Troy Oz. Platinum (Scrap, Bid) = Fr 18.66 - Fr 21.77 (USD$ 3.90 - 4.55)
1874: 1 Troy Oz. Platinum (Ingot, Mkt) = Fr 27.99 (USD$ 5.85)

1874: 1 Troy Oz. Platinum (Semi-Mfg) = Fr 31.10  (USD$ 6.50)

Platinum is very expensive. In 1874, a kilogram of old wrought platinum (used in the concentration of sulfuric acid for example) was recycled to vendors for Fr. 600 to 700. In ingots, it was Fr 900./kg., and finally manufactured, Fr. 1,000./kg.
 

Citation: Traité des gîtes minéraux et métallifères, recherches, étude et ..., Vol. 2; Edmond Fuchs, Louis Launay (1892) p. 995

c.1872-1874: