This is a great Flottenkriegsabzeichen (High Seas Fleet badge) by maker Schwerin from Berlin.
Schwerin is known to be the maker of the best looking Flottenkriegsabzeichen! Adolf Bock who’s name is also on the reverse is the artist and designer from Berlin, of the badge.
The badge is textbook in all parts, even the die weakness with the fifth port (on the left) being nearly invisible is present.
With just the right wear and tear, showing the base material in all it’s excellance.
If you want only one of these badges, then this is the one you need, its from the best known quality maker of these badges, textbook and in great condition!