Luftwaffe badge from Peenemunde where the Germans had there rocket program

This badge came from my grandfather who was a major in the Luftwaffe and worked in Peenemunde on the rocket program, i.e. V-1, V-2 etc....  I've never seen one of these anywhere except for this one and another one I'm selling also from Peenemunde but looks different. Not sure what to ask for it so I'll go with an educated guess of $400 o.b.o but must be a reasonable offer. as with all my items you have a hundred percent money back guarantee if not satisfied

Note it's a early tail down eagle! It's about 2" to 2 1\2" in size.