This Italian text apparently quotes British catalogue prices for the PGMs.
1905: 1 Troy Ounce of Rhodium = £ 21.77 (USD$ 106.)
1910: 1 Troy Ounce of Rhodium = £ 18.46 (USD$ 90.69)
1908: 1 Troy Ounce of Iridium = £ 10.97 (USD$ 53.44)
1910: 1 Troy Ounce of Iridium = £ 21.95 (USD$ 106.67)
c.1899: 1 Troy Ounce of Osmium= £ (USD$ )
1877: 1 Troy Ounce of Platinum = £ (USD$ )
Citation: Treatise on general and industrial inorganic chemistry, By Ettore Molinari (1920) p.850
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