Mark Twain and Grant Wood

Would anyone be able to tell me what these coins might be worth?

 

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They are actually medallions not coins.
Do you know what material they are made of?
Brass, gold?

Does the Grant Wood reverse look like this?

 

X2

 

These are 1 oz, 90% gold medallions sold by the U.S. Mint to compete with the Krugerrand and other bullion offerings at the time. A quick check of eBay shows listings slightly over the spot price for gold ($1417/oz as I type this); slightly higher for those graded by third party services.

These links may help:
1980 Grant Wood
1981 Mark Twain

 

Thank you!

 

Yes. That's it. The other post says it's gold and copper.