UK, 1875: Johnson & Matthey Still

1875:

1874/5: 1 Troy Oz. Platinum (39% ore at purity) £ 1.00 - 1.05 (USD$ 5.59)

Citation: Report on the Geology & Gold Fields of Otago;  Frederick Wollaston Hutton, George H. F. Ulrich, J. G. Black, James McKerrow (1875)




1875:  1 Troy  Oz. Platinum  (semi-mfg., retail)  = £ 2.00  (USD$ 11.18)

Citation: Introduction to experimental physics, theoretical and practical: including ... Adolf Ferdinand Weinhold, Benjamin Loewy, George Carey Foster (1875) addendum advert 









1875:  1 Troy  Oz. Platinum  (mfg., whols.)  = £ 2.55 - 3.75  (USD$ 14. - 21)

c.1875

1876: April 1876 Swindle, with counterfeit Gold Coins

Citation: Reports from Her Majesty's consuls on the manufactures, commerce ..., Vol. 19, Foreign Office p.1621


1872:


1875 Oertling's Decimal Avoirdupois Grain Weights (~8,210+10 grains avd.) not in excess of 17.125 Ozt (532.65 g.)



Prof. Edward Divers, responsible for the chemical laboratory at Imperial College of Engineering in Tokyo, Japan, ordered Platinumware from London.