I have a 1940 mercury dime with no mint mark..is it worth anything?

I'm not sure I've only been to the coin exchange as a customer not a employer, nor do I have experience in old currency. Sorry that is something you'll have to go there and ask for yourself. I will tell you this, the lady that works there is real fare and doesn't try to take advantage of people

Hello Ysidra, Of course I would need to see your coin in person to determine the grade, but it can range anywhere from $1.10 for the silver to $15.00 if its in mint state (MS) condition. Please let me know if you have any other questions, Sara