1837 platina yield: 4,748.66 Funt = 62,521.4 Ozt. = 1,944.6 Kgs.
Citation: Histoire des progrès de la géologie de 1834 à 1845: (Pt. 1. Terrain) ; Archiac (1848)
RUSSIA. Nicholas I, 1825-1855. Platinum 12 Rubles, 1837 (mintage: 53)
Sold by Stack's from the Gund Collection on 1/15/2007 for $55,200
2/6/2014: Auction Sale, Proof 12-Rouble, 1837 € 123,000. (USD$ 167,302.)
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