Morgan and Peace dollars - 26.7 gm
Eisenhower dollars - 22.7 gm
SBA, Sacagawea, and Presidential dollars - 8.1 gm
A US dollar coin dated 1797 is a Draped Bust dollar. If you actually have a dollar coin dated 1797, take it to a coin dealer for an accurate assessment. The coin is rare.
The present 50 cent piece has a weight of 11.340 grams (0.365 troy ounce)
1 dollar
Dollar coins are larger in size and amount.
Then that coin is a error and is worth a whole lot more than a dollar First look at the edge of the coin for the date & mintmark.
The standard weight is 33.4 gm for an unworn $20 coin issued from 1849 to 1932.
An 1857 Indian Head gold one dollar coin should weigh 1.672 grams.
1 oz
.50 AGW
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.)
The Actual Gold Weight (AGW) of this coin is .04837oz of pure gold.
The most basic thing is the weight and diameter of the coin. if you have doubts about the authenticity of the coin, take it to a coin dealer for an assessment.
The weight of this coin is 8.359 grams and has .24187oz pure gold. This standard is for all Half Eagles from 1839 to 1929.
A dollar bill weighs 1 gram A modern dollar coin weighs 8.1 grams
All US 20 Dollar gold coins have a weight of 33.436 grams.
The original weight at minting was 26.73 grams. Of course a circulated coin will weigh slightly less.
The Actual Gold Weight (AGW) of an 1857 Indian Head gold one dollar coin is .04837oz of pure gold.