Hello and welcome to the forum.
Your Ostmedaille looks like a good one despite the damaged ring, but unfortunately, I am afraid I am not comfortable at all with the Round 3 EK2....
Leaving aside the sloppy re-paint, I have never seen this style of frame on a genuine 'Round 3', but I have seen it on some fakes.
As far as I am aware, all 'Round 3' EK2's have a 'hump' at the top of the frame where the jump ring is attached - unlike yours.
I would like to hear what the other guys thinks about this one.
For illustration purposes, the image below shows 2 types of 'Round 3', the 'bevelled edge', and the 'plateau', both have the afore mentioned 'hump' as do the Deschler version and the unknown.
The image below that shows a known fake 'Round 3' with what I believe to be the same frame type as yours.
Regards - Danny