1868/9: 1 Troy Oz. Platinum (ingot, market) = £ 1.20 (USD$ 8.20)
Presumable ore at the intrinsic rate, Dr. Alexander Jamieson's London price record for wholesale Platinum Sponge (1870-93) may be compared to this other records, (presumably, currency adjusted for fineness to Spot-Price for import crude ingot & Ural ore.)
Citation: The Electrical Engineer, Vol. 15, No. 254, 3/15/1893 p.268
1870: 1 Troy Oz. Pt (London, bulk) ~ £ 0.90 (USD$ 5.03)
1870: 1 Troy Oz. Platinum (semi-mfg, retail) ~ £ 2.38 (USD$ 13.88)
1870: 1 Troy Oz. Platinum (Semi-mfg, Whols./Ret.) = £ 1.60 (USD$ 8.94)
Citation: Catologue of Optical, Mathematical & Philosophical Instruments Manufactur'd & Sold by Wm Ladd, (1870) p.19
1870: 1 Troy Oz. Platinum (Money changer's rate) = £ 1.43 (~USD$ 8.0)
Citation: The Coin Book ; Isaac Smith Homans, Robert Mushet (1871) p.197
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