Glad to see this thread is still "rocking"
I'm adding a few more pics of the flag and Grimminger
Here's what got of him on a quick search:
Decorated with the Golden Party Badge, the Blood Order (no. 714) and the Coburg Badge, three of the most important decorations of the NSDAP.
Survived the war, and was put on trial by the Allies in 1946 for being a member of the SS and carrying the Blutfahne for nineteen years. Died in 1969 in poverty
One crazy idea: are there any postwar interviews of him?