Each coin has its own value based on condition, mint mark, variety and other characteristics. To get an estimated value you should make an inquiry for each coin individually in order to get the most complete answer.
a quarter
1942D is a common date/mint coin with retail values of $3.00-$4.00 for average coins
No mint mark means it was minted in Philadelphia. The quarter is worth exactly 25 cents.
$3.00- $2,750.00 dollars
See the Related Question for values. Prices for 1942 quarters aren't dependent on the mint mark.
Melt? $5.80. Depending on mint mark and condition it might be worth more.
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.
YES I have one.
$20-$1,300
The value of a 1942 quarter depends on its condition and mint mark. Common circulated coins typically sell for around $5 to $7, while those in better condition or with rare mint marks can have a higher value. It's recommended to consult a coin collector or dealer for a more accurate appraisal.
$4-$10 depending on condition. If mint condition around $20.
Check that coin again. Mint marks were on all quarters by 1981.