WW2 Kriegsmarine (German Navy) minesweeper badge by the “high quality” manufacturer Fec. Otto Placzek Berlin Ausf. Schwerin Berlin.
Note: Due to the Schwerin marked badges commanding a slightly higher price / being more “desirable” than other Kriegsmarine Minesweeper badges this is one that is heavily copied / reproduced. Compare as many details as possible to an in hand version before moving forward with any purchase.