8.1 grams.
All "golden" dollar coins weigh 8.1 gm. See the link below for other coins' weights.
The George Washington dollar coin was the first of the Presidential dollar series. It was minted in 2007.
All modern presidential dollar coins are worth one dollar.
Unless the coin has a minting error, it's just face value--one dollar. The most common minting error is missing edge inscriptions on the George Washington dollar.
8.1 grams.
Susan B. Anthony (1979-81 and 1999), Sacajawea (2000-) and Presidential (2007-) dollar coins all weigh approximately 8.1 grams. Despite the different pictures and metals the coins were designed to be the same size and weight so they could be used interchangeably, especially in vending machines and coin-counters.
1.672 grams
All current U.S. $1 coins weigh 8.1 grams. Coin specifications are no longer given in old English units. Weights and diameters are now both in metric units.
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.
A circulating copper-clad Ike dollar weighs 22.68 grams (or slightly less if it's visibly worn).
A 1963 silver dollar, also known as a Peace dollar or Eisenhower dollar, has a weight of 26.73 grams or about 0.9429 ounces.
The copper-nickel coins weigh 22.68 grams. The 40% silver coins weigh 24.59 grams.
It's a circulating coin, a dollar