Gold is calculated by weight , grains, grams , or troy ounce. You would receive the melt price if you can arrange enough of the to make a full grain, gram , etc . Also gold prices are calculated by purity ... 24 karat being the purest and 7 karat relatively speaking containing more base metal . These are the factors which determine liquidation price per lot of gold.
These stamps are pressed into gold foil .
Gold foil is used from decorative purposes and has little to no weight . You do have a genuine FDC IF the cancel presents it ...
The "sticking point" here is bullion vs foil . That stamp is gold ... gold foil not gold bullion.
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Melt price for gold ...Info at:
http://www.silverrecyclers.com/Calc...culator.aspx