How many 1921 dollars are there?

Circulated grades: Worn 1921 dollars are extremely common. Probably, 10 to 15 million exist. Time was in the mid-1960s when the majority of dollars seen at Nevada gaming tables were 1921 dollars (Philadelphia coins primarily, but also Denver and San Francisco Morgan dollars).

Can you still buy 1921 Morgan dollars?

The new silver certificates mentioned above are the Series of 1923. According to a notice in the June 1934 issue of The Numismatist (p. 416), collectors could still purchase Uncirculated 1921 Morgan Dollars for "the face value of the coins and an amount sufficient to cover the mail charrges by first-class mail."

What is the difference between a 1881-s dollar and a 1921 Morgan?

If you want to see an amazing study in contrasts, simply compare a certified MS-65 1881-S dollar with a like certified 1921 Morgan; there is virtually no similarity whatsoever! Most known specimens are in low grades such as MS-60, 61, or 62. The striking is so poor that the difference between an MS-60 and a lightly circulated AU-58 is often moot.