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1.672 grams
8.1 grams.
The weight is 8.1 grams.
It's a Half Dollar NOT a dollar coin. The coin weighs 12.50 grams and contains .36169oz of pure silver.
An 1891 dollar coin is a Morgan dollar, and therefore should weigh 26.73 grams. (This is the official weight when issued from the mint. If the coin was substantially circulated, it may weigh less due to wear.)
An 1857 Indian Head gold one dollar coin should weigh 1.672 grams.
All US 20 Dollar gold coins have a weight of 33.436 grams.
One method to determine the authenticity is to weigh the coin. A genuine U.S. silver dollar should weigh 26.73 grams.
The copper-nickel coins weigh 22.68 grams. The 40% silver coins weigh 24.59 grams.
All US 20 Dollar gold coins have a weight of 33.436 grams.
A new U.S. quarter dollar coin weighs 5.67 grams.
A 1924 Saint-Gaudens $20 gold coin weighs 33.436 grams and of that weight, gold comprises 30.092 grams.