USA, 1920: Metals Chart, Platinum Death Spike Evident

January, 1920: 1 Troy Ounce Platinum (SF Spot: .999) = USD$ 150.

January, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 154.
February, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 152.
February, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 152.50
March, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 140. 
March, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 140.20
April, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 128.
April, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 128.50
May, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 96.
May, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 96.10
June, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 85.50
June, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 85.50
July, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 85.
July, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 82.50
August, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 115.
August, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 111. 
September, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 115.
September, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 115.62
October, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 103.
October, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 103.50
November, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 89.
November, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 89.39
December, 1920: 1 Troy Oz. Platinum (SF Spot: .999) = USD$ 85.
December, 1920: 1 Troy Oz. Platinum (NYC Spot: .999) = USD$ 80.

Citation: "Mineral Industry of California" Bulletin, Issue 90, p.70

Refined Platinum ingot in bulk @ New York:
 





1920: PGMs

Citation: Mineral Resources of the United States, Part 1 pp. 43-4

1920: Monthly Prices for


January 1920 - August 1921: Platinum fell -59.4%

Iridium fell about -55% from January - June 1921.

January 26, 1920: NY Spot Price = $160./oz
August 1, 1921: NY Spot Price = $ 65./oz

More here. (fwiw, with wartime price controls, Platinum did not reach $160. again until January 1968, 48 years later.)

1919-20


1911 - 1921: Average Colombian Ore Price, US Import

Citation: The Jewelers' Circular, Vol. 85, Issue 2 (11/1/1922) p.77



1911 - 1921: Refined Platinum Price, New York

Citation: Engineering and mining journal, Vol. 112; American Institute of Mining Engineers (1921) p.478


A notable coin-sale in mid-December 1921 records the numismatic value of Russian Roubles in the USA, illustrating the collector's premium (44.37 - 71. 5%) nearly two years after the 1919 Peak. The lowest price/premium (11.8%) may have approximated the retail price for scrap Platinum. (Also ironically, the more expensive 'proof' coins might have been late counterfeits.)

December, 1921: 1 Troy Ounce Platinum (NY Spot) = USD$ 78.19
December 15, 1921: 1 Troy Ounce Platinum (Rouble, numismatic: High) = USD$ 134.
December 15, 1921: 1 Troy Ounce Platinum (Rouble, numismatic: Low) = USD$ 87.40

Citation: The Numismatist, Vol. 35 (May 1922) ; American Numismatic Association, p.225




Citation: Metal industry, Vol. 19 (1921), p.56


Citation: Metal industry, Vol. 19 (1921), p.338 (350)

Citation: Metal industry, Vol. 19 (1921), p.56

Citation: Bulletin, Issue 90, California State Mining Bureau, California. Division of Mines and Geology (1921) p.70


Iridium fell from $325. > $165. in 6 months.

1/26/1921:

3/1/1921:


3/9/1921:

3/16/1921:

6/15/1921:


6/22/1921:



6/14/1922:



Adjusting for Real Inflation since 1920 (5,206%) we can extrapolate the "1920 Peak" spot price for Platinum (refined ingot, 89% pure) to be $ 8,490. (in 2009 USD$.)

Adjusting for Real Inflation since 1921 (5,238%) the lowest 1921 Platinum Spot Price for would be $ 3,469. (in 2009 USD$.)