June 1907: 1 Troy Ounce Platinum (US whols. mkt, .999) ~ £ 6.33
Where the 12-Rouble Coin and 6-Rouble Coin weighed 1.3292 ozt. (638 Grains Troy) and .6655 ozt, respectively, the August 1907 price for the "fine and scarce date" 6-Rouble Coin sold without numismatic value at the refined market price.
The numismatic premium for the somewhat rare 1837 12-Rouble Coin at auction was ~ 45%. At that same rate by rarity, in 1907 the 1839 12-Rouble ought to have sold for ~ £ 83., a premium of 1,200%.
About 100 years later, UBS Gold & Numismatics (Auction 50, Feb 1, 2001) actually sold a 1839 12-Rouble for $60,500 (equivalent to $45,517/ozt.) or a premium of 7,436% over the intrinsic value (Pt = USD$ 604./ozt.)
http://www.ubs.com/global/en/about_ubs/about_us/news/news.html/fr/2001/01/15/news_15_01_2001.html
1907: 1 Troy Oz. Platinum (London, numismatic) = £6.3950 (USD$ 31.12)
1907: 1 Troy Oz. Platinum (London, numismatic) = £ 9.2036 (USD$ 44.79)
Citation: Auction sale prices: Supplement to The Connoisseur ..., Volumes 9-10 Sept 1907 p.469
December 1906 Sale of rare pattern
Citation: American Journal of Numismatics, Vol. 42 Ed Charles Edward Anthon p.28
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