There is not always a mint mark on coins. If your coin does not have a mintmark it means that it was made at the Philadelphia mint in Pennsylvania.
In G-4 $6.00 to $185.00 in MS-60
its from the phillidelphia mint
a quarter
made in the Philadelphia Mint
No mint mark means it was minted in Philadelphia. The quarter is worth exactly 25 cents.
The lack of a mint mark indicates that the coin was minted in Philadelphia. The mint mark P wasn't added to quarters until 1980.
The 4 mints producing the 1908 Barber Dime were;(1) Denver which uses the letter "D" for a mint mark, (2) New Orleans which used the letter "O" for a mint mark, (3) San Francisco which uses the letter "S" for a mint mark and (4) Philadelphia which did not place a mint mark on this coin.
This date regardless of mint mark is valued for the silver and is worth about $3.25
If it has one it'll be on the reverse below the eagle. No mint mark = Philadelphia, D = Denver.
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.
Melt? $5.80. Depending on mint mark and condition it might be worth more.
If it has one it'll be on the reverse below the eagle. No mint mark = Philadelphia, D = Denver.