1892?: 1 Troy Ounce Platinum (Ore, Intrinsic, Mkt?) = ℳ 37.324 (USD$ )
"Prices of platinum weights in sets and individually is calculated at the base price of ℳ 1.20 per gram in platina ore, while rising price of platinum the excess amount is attributable."
Grove's Battery 15.5 cm = ℳ 25.
Grove's Battery 11 cm = ℳ 15.
Citation: Preis-verzeichnis uber physikalische apparate, instrumente und geratschaften; C. Gerhardt (1893)
1893: 1 Troy Ounce Platinum (semi-mfg; whols/ret) = ℳ 39.657 (USD$ 9.46)
Citation: Die Metalle: Geschichte, Vorkommen und Gewinnung, nebst ausführlicher ...Bernhard Neumann p.363
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