UK, 1817

October 1805-16: 1 Troy Oz. Platinum (Scrap, Trade)  = £ 0.25 (USD$ 1.00)
1816: 1 Troy Oz. Platinum (Scrap, Trade)  = £ 0.5641 (USD$ )

1816: 1 Troy Ounce Platinum (Cary, retail)  = £ 0.8751 (Fr 21.70) 

 Wollaston sold ~3,250 Ozt (~101.1 kgs) Platinum in 1817.   

Chaldecott (1979) presumes the 1817 expense £ 220. for 1,400 ozt of Bollman's platina; another scholar cites 2,084 Ozt. for £ 298., or very nearly £ 4.60 per Kg. ore [Platinum Metals Rev., 1979, 23, (3), p.115] ~ £ 6.13 per Kg. Pt intrinsic

1817: 1 Troy Oz. platina (Bollman contract, London)  = £ 0.1430  

1817: 1 Troy Oz. platina (Vaughan of Phila.)  = £ 0.1082 
1817: 1 Troy Oz. platina (London: Thom. Coutts & Co)  = £ 0.1571

 1817: 1 Troy Oz Platinum (London: Sponge) ~ £ 0.55 (12s.)

March, 1817: 1 Troy Oz. Platinum (Cuoq & Courturier) = £ 0.5932
March, 1817: 1 Troy Oz. Platinum (fully mfg still) = £ 0.7360
   
News from the April 1817 meeting of the Societe D'Encourgement Pour L'Industrie Nationale was published in London that June.

Citation: Philosophical Magazine, Vol. 49 N. 230 (June, 1817) p.463
 

Citation: Bulletin de la Societe D'Encourgement Pour L'Industrie Nationale April 1817




2) Dated information appears in US Congressional documents.  (Wholesale abroad, without duty, transport nor profit.)  Secretary of State John Q. Adams' 1821 report cited an earlier common price for refined Platinum, c. 1819? John Q. Adams was Ambassador in London through the Summer of 1817.

c.1817: 1 Troy Oz. Platinum (Paris: Sponge) ~ USD$ 2.50 (Fr. 13.43)
c.1817: 1 Troy Oz. Platinum (London: Sponge) ~ USD$ 2.50 (£ 0.5703) 

This 1824 report appeared as the Platinum price was peaking, 1821-5; Colombian platina was trading at very high premium, and British and French (erroneously) reported the Russian Mint was paying the equivalent of $ 7. -10.

The Paris price for worked Platinum is known, from the dentist, Maury.  In 1820 - 21, the average low price for worked Platinum in both London & Paris appears to be ~ $ 4.00, far above "$2.50." 

 c.1817: 1 Troy Oz Platinum (London: Sponge) ~ £ 0.55 (12s.)

The cost of importing and manuafacturing European metal would have added considerably to the price.

Citation: Two tracts: on the proposed alteration of the tariff; and on weights ... Thomas Cooper, United States. 18th Cong., 1st sess., 1823-1824, London (England) p.41

c.1816/7: Mock Gold, alloy of John Thomas Cooper:
Citation: The Quarterly Journal of Science and the Arts, Vol. 3 (1817)