It's an ounce of gold, so bullion value is currently $425. You can probably sell at a very slight premium, and buy at a slightly larger premium. There is at least one dealer presently offering $50 AGEs for $442. With few exceptions minting dates are unimportant in the bullion market, which is focused on investment, not collecting.
If it's a Proof 1 oz gold eagle - you can get $650 for it pretty easy. But your title says 70 - I assume the coin is graded ? If so, by who ? That would make a difference as well.
Sorry, let me clarify... Its a PR70 DCAM graded by NTC (Numistrust Corporation). Thanks again for the replys!