See the related link below for a picture.
what does a equals in unit
Please look at the coin again, no Us one dollar goldcoins dated 1921 were ever struck.
The 1891 Morgan Silver Dollar can be seen by using the link to a picture of this coin.
It doesn't look like anything because there's no such thing.
The U.S. does not have a "M" mintmark. Look at the coin again and post new question.
All 1921 $1 coins carry an image of Miss Liberty's head. If your coin says HALF DOLLAR on the back (you DID look at the back, didn't you?) there's more information and a price at the Related Question.
Please look at the coin again, no Us one dollar goldcoins dated 1921 were ever struck.
The type of dollar coin at the time was called a Morgan dollar. Run a search on Google Images to find a picture. They were minted 1878-1904 and again in 1921.
The simple answer is, look on the back of the coin. The rock the eagle is on has the word PEACE on it.
Please look at the coin again. There are no 1921 CC Morgan dollars.
There's no such coin. All 1921 $1 coins carry an image of Miss Liberty's head. If your coin says HALF DOLLAR on the back (you DID look at the back, didn't you?) there's more information and a price guide linked below.
On a US silver dollar, the mintmark is in a variety of locations, on a Morgan Dollar ( 1878-1921) it is underneath the tail feathers of the eagle between the D and the O in Dollar. On a Peace Dollar (1921-1935) it is located underneath the One in "One Dollar" on the reverse on an Eisenhower Dollar (1971-1978) it is between the 3rd and 4th numbers of the date by Eisenhower's neck. If there is no mintmark, the coin was minted in Philadelphia, if there is a D mintmark, the coin was minted in Denver, if there is an O mintmark the coin was minted in New Orleans, if there is an S mintmark the coin was minted in San Fransisco and if there is a CC mintmark the coin was minted in Carson City
The 1891 Morgan Silver Dollar can be seen by using the link to a picture of this coin.
The U.S. does not have a "M" mintmark. Look at the coin again and post new question.
It doesn't look like anything because there's no such thing.
The Walking Liberty design is was only used on half-dollars in 1921. Look at the coin again and post new question.
The first Peace dollar was struck in 1921 and no U.S. dollar coins of any kind are dated 1909, none were made. Look at the coin again and post new question.
All 1921 $1 coins carry an image of Miss Liberty's head. If your coin says HALF DOLLAR on the back (you DID look at the back, didn't you?) there's more information and a price at the Related Question.