I used to be in the ancient coin business, and I came to learn a fair amount about ancient coins, but wasn’t much into the sales end. While ancients and U.S. coin markets have differences, there are similarities as well…
(However, I’d say, by way of example, that Michelle or Coosa’s advice about cats and dogs is far, far more expert than my advice about coins.)
(I used to work in Bruce McNall’s coin company. He owned the LA Kings. Then he and several others went to jail. company went belly up. Now I’m a paralegal…)
Anthracite is pretty much on target. Try looking at the Red Book value, but be prepared to get a fraction of that, particularly if you need/want to liquidate right away. This is often a problem when individuals want to liquidate an inheritance or if someone buys coins as an investment. They just aren’t very liquid (ironic that investing in MONEY isn’t very liquid).
Obviously, looking at a price guide will give you some idea how much time you should spend pursuing this. I certainly would not pay to have the coins graded unless they are certain to be worth it. (I do know that grades are far more standardized in U.S. than in foreign and ancients, and that a grade helps “set” the value of the coin–subject, again, to the liquidity issue above)
I don’t want to sound overly pessimistic, but even if your coin is old, it has to be fairly uncommon AND in very good to excellent condition to be worth all that much. There are some fairly nicely preserved ancient coins, some dating back as far as 300 A.D. Bronze. Worth about $50, maybe less. This isn’t to say that YOUR coins aren’t worth anything, but don’t get the hopes too high until you’ve looked at a price guide.
If your coins look like they might be worth the time to pursue this further, go to a coin dealer or two and ask how much he wants for them. If you aren’t in a hurry to get the cash, the dealer may take them on consignment, meaning he sells them and gets a commission off the sale price. He may sell them over the counter or in an auction. It may be possible for you to set a reserve, or minimum price, but be aware that if you put them up for auction and the reserve price isn’t met, the dealer may charge you a percentage of the reserve.
There’s probably more I could add, but this is already a long post. I really hope things work out for you. Let us know what happens, and if you have any further questions, reply to this thread or e-mail me (see my profile). But again, though I have some knowledge, I’m not an expert.
Hope this helps.