First off, I'm not an expert on every variation EK 39 2nd there is....up until a few years ago, I never heard of a "round 3" and wouldn't even have paid any attention....."now I would!"
There are several major "question marks" that I can see....it might be the camera angle, etc. but the small ring on the top that holds the larger ring for the ribbon looks "flat", and if there's a "circle" around where it attaches to the frame- it's a modern restrike! (blurry, but looks like it does!)......the edging on the frame , especially where it joins together also looks questionable. Many more pictures would be needed, but I'm not liking what I see....
There are 4 "rounder" variants in Niemann's book.....all are differant than this one. I'd pass unless someone knows for sure!