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.

Wave detailing on the Schwerin Minesweeper badge – which is hard to reproduce both in quantity and style/detail.

Although difficult to determine, due to the lighting, the early stages of verdigris (green patina) can be seen in the guilded areas of the oakleaf wreath.

Reverse showing the typical hinge block construction

Full makers mark with raised lettering:
Fec. Otto Placzek Berlin
Ausf. Schwerin Berlin

Angled view showing the flatwire catch and the “coke” bottle style pin.