Looks good and looks like a Deumer from the pics but better phots will confirm
"In all my years as a soldier, I have never seen men fight so hard." - SS Obergruppenfuhrer Wilhelm Bittrich - Arnhem
Looks good to me too, can't see much of the date from these pics though. Take a peek on the inside of the pin, to see if it's marked 20 or L/52 for C.F. Zimmermann.
looks a Zimmermann to me.