I think the DDR you may be thinking of is the 1971 Philadelphia DDR which is much more valuable than the Denver DDR. I'm not a dealer but in EF 40 grade it has a value of 20 bucks roughly, to give you an idea. Showing the obverse might help someone more knowledgeable than myself determine the grade and value. Not sure if it's a DDR but Silver and nickel colored coins seem to be more difficult to show doubling in my opinion.
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