USA, 1928

1928: 1 Troy Ounce platina (Colombian ore) = USD$ 67.41
1928: 1 Troy Oz. PGMs (Colombian ore) = USD$ 71.37
 
1928: 1 Troy Oz. Platinum (Russian ingot) = USD$ 74.99
1928: 1 Troy Oz. Platinum (German Sheet) = USD$ 80.09 
1928: 1 Troy Oz. Iridium (mkt) = USD$ 117.96 
1928: 1 Troy Oz. Osmium (mkt) = USD$ 65.51
1928: 1 Troy Oz. Palladium (mkt) = USD$ 60.60
1928: 1 Troy Oz. Rhodium(mkt) = USD$ 53.13
 


Citation: Foreign Commerce and Navigation of the USA 1928. Bureau of the Census (1929) p.279