Russia, 1891

1891: 1 Troy Oz. platina (Ural Contract: 83% ore) =13.29 руб
1891: 1 Troy Oz. Pt (Contract @ .999) =16.01 руб
1891: Russian Refiner's Cost @212 руб/Poud = 0.4025 руб 
1891: 1 Troy Oz. Platinum (SPb: Refined Poud) =16.417 руб 

Citation: The Mineral Industry, Vol. 7 (1899) p.570





June, 1890: 1 Troy Oz. platina (SPb, mkt) = 23.74 руб (USD$ 16.18)
December, 1891: 1 Troy Oz. platina (SPb, mkt) = 11.96 руб (USD$ 5.87)

December, 1893: 1 Troy Oz. platina (SPb, mkt) = 9.12 руб (USD$ 4.48)
1893: 1 Troy Oz. platina (Ekaterinburg) = 8.68 руб (USD$ 4.26)

December, 1895: 1 Troy Oz. platina (SPb, mkt) = 13.67 руб (USD$ 4.98)

Citation: Recueil Consulaire Contenant les Rapports Commerciaux des Agents..., Vol. 95 Belgium (1897) p. 357


Citation: Archives des sciences physiques et naturelles, Vol. 15 1903


1891: 1 Troy Oz. platina (Russia, export: crude ingot?) ~ USD$ 5.6958

c.1890/1?
Citation: Journal of the Society of Chemical Industry, Vol. 11 June 1892 p.533

(US govt estimate, from Silver Rouble, @$0.10)
Citation: Monthly Summary of Commerce and Finance of the United States (1899) p. 2587