Please post a new question with the coin's denomination.
Assuming it's a 1925 Saint-Gaudens with no mint mark value is from $950.00 to $1,100.00 in circulated condition.
Value ranges from less than $1 to $24,000 depending upon the condition of the coin and which mint mark or mint mark error is on the coin.
No mint mark indicates that it was minted in Philadelphia. The coin is worth exactly one cent.
The mint mark, if present, is located in the triangular area between the word ONE and the eagle's tail. Remember that Philadelphia did not use a mint mark in those days, so if there is a blank space your coin is from Philly. Technically it's listed as just "1925" rather than "1925-P"
$22 to $22,000 depending upon the mint mark and the condition of the coin.
You will need to provide to me the coin's denomination, its mint mark, and its mint condition in order for me to relay its worth to you.
The M is not a mint mark but on every coin and is on the right side. The mint mark is to the left od the date slightly above.
Value is determined by grade and mint mark. Assuming the coin has no mint mark in VF-20 $275.00 to $350.00 in MS-60.
mint mark is to the left of the value on the reverse.
The mint mark by itself isn't worth much. It has to be on a coin. If you do have a 2001 coin with a D mint mark, it's far too new to have any special value unless it's a high-quality uncirculated coin.
By 1925, Liberty nickels hadn't been minted for 12 years, and M isn't a mint mark.
$52 to $1450 depending upon the condition of the coin and the mint mark.