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Hello kuv, I love Calliphoridae but I have not met all of the Calliphoridae of Germany. I have no specimens from this genus of Protocalliphora. Using keys can be difficult.

I arrive at Protocalliphora because of the obvious stripes on the mesonotum. I think that these are absent in Protophormia. The frons is narrow. The calypters are infuscated. I cannot see other details in this photo but I have to think that this is Protocalliphora azurea. Of the known Protocalliphora in Germany, Protocalliphora azurea is the only one with infuscated calypters. Males are known to be dark blue, especially so early in the year. So unless someone has a reason to disagree, then I think that this is a male Protocalliphora azurea.

I wish that I had them in my collection. I only have scientific experience with Calliphora, Lucilia, Melinda, Onesia and Pollenia. I use the work of Dr. Rognes to deduce the possibilities of the fly in your photo. I could be wrong but I really think that it fits Protocalliphora azurea.

Enjoy the day :)