1866: 1 Troy Ounce Iridium (Ingot, "pure") = £ 6.3 (USD$ 43.34)
1866/7: 1 Troy Oz. Platinum (Scrap, Retail) ~ £ 1.00 (USD$ 6.88)
Unsubstantiate, non-professional price reference (likely retail.)
1866: 1 Troy Oz. Platinum (Retail?) = £ 1.58 (USD$ 10.84)
Where 3-руб Platinum coin weighed 10.35 g, 3-руб in Silver worth £ 0.4753/0.4821
(3-руб Kr. exchanged for £ 0.444 - 0.322), Platinum had a ~10.5% premium over Silver.
1866: 1 Troy Oz. Platinum (Retail) = £ 1.58 (USD$ 10.84)
Citation: 13th Report of the Science & Art Department of the Committee of the Council on Education, Vol.14 (1866) p.257
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