Minesweeper War Badge. Type Petz & Lorenz, Unterreichenbach

Tombak/brass based and in a very good, probably unworn condition. The wreath with all of the gilt plate still present. The explosion with all of the silver plate and the waves dark oxidised.
Not marked but a known variation that has been attributed to the company of Petz & Lorenz, Unterreichenbach. See Weber/Skora, The War Badges of the Kriegsmarine.
Very difficult to find.