Looks like a nice one to submit to someone. Get a couple more of them (3 total) then send images to see if they would be interested in listing them first. But looks list able to me.
Think it looks close to coppercoins.com 1964d-1mm-032. Which say is also a DDR listed as 1964d-1dr-005. Check attributions for each to see. CC example is MDS, OP's coin appears different state...?
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