The value of such a coin would depend upon the date, the denomination of the coin and the condition it is in.
A lot of coins don't have a mintmark. Dates and denominations are needed. Post new question with more information.
The coin is 25 cents, the "P" mint mark was not used on US quarters until 1980
If it has a D mint mark it's worth 1¢ If it has an S mint mark, it WAS a proof coin worth about $1.40, but now that it's been removed from its Mint holder, it's lost most if not all of that extra value.
If it has a D mint mark it's worth 1¢ If it has an S mint mark, it WAS a proof coin worth about a $1.50, but now that it's been removed from its Mint holder, it's lost most if not all of that extra value.
This date regardless of mint mark is valued for the silver and is worth about $3.25
It is worth .25¢ The absence of a mint mark simply means it was minted at Philadelphia.
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.
The date and mint mark are on the the edge of the coin
$680 to $27,500 depending upon the mint mark and the condition of the coin.
That depends on the mint mark, purity, condition, rarity, age and size of the coin.
The coin is 25 cents, the "P" mint mark was not used on US quarters until 1980
G isn't a mint mark for anywhere, and you didn't specify which type of coin.
maybe $2 depending on condition
$1 to $4500 depending upon the mint mark and the condition of the coin.
$24 to $500,000 depending upon the mint mark and the condition of the coin.
$30 to $55,000 depending upon the mint mark and the condition of the coin.
$27 to $50,000 depending upon the mint mark and the condition of then coin.
All depends on year and mint mark