It's worth more for the silver (about $2.00) than the buying power in 1950.
It's actually called a Roosevelt dime; the last Liberty dimes were minted in 1945. There's more information at the Related Question.
A typical run-of-the-mill 1975 dime is worth $0.10. A rare specimen might be worth more, but since you didn't give us any distinguishing characteristics, we can't help you.
A Dollar
The reason is because the dime used to be made of silver, while the nickel has always been a copper/nickel blend. Silver is worth more, which is why the coin could be smaller, but worth more. There used to be a silver half-dime, but the coin was so small that it was replaced by the nickel.
yes
Mercury dimes were minted from 1916 to 1945. Your coin is called a Liberty Seated dime. Please see the Related Question for more.
In general no. Just because a dime has a mintmark does not make it more valuable.
The 1969-S dime is a Proof coin, that's why it has higher value.
Mercury dimes were minted from 1916 to 1945. Your coin is called a Liberty Seated dime. Please see the Related Question for more.
Mercury dimes were minted from 1916 to 1945. Your coin is called a Liberty Seated dime. Please see the Related Question for more.
It depends on how much wear it has. the more wear, the less it is worth.