Zinc based and in an excellent, probably unworn condition. The wreath with all of the gilt plate. The explosion with all of the silver plate still present and some slight patina.
Not marked but a known variation that has been attributed to the company of Wilhelm Deumer from Lüdenscheid. See Weber/Skora, The War Badges of the Kriegsmarine.
Best condition example with vertical pin.

Zinc based and in an excellent, 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 Wilhelm Deumer, Lüdenscheid. See Weber/Skora, The War Badges of the Kriegsmarine. With the typical horizontal pin and top hook.
Best condition example.

Tombak/brass based and in a good, worn condition with some patina.
Not marked but a known variation that has been attributed to the company of Wilhelm Deumer, Lüdenscheid. With typical, horizontal pin.
See Weber/Skora, The War Badges of the Kriegsmarine.

Tombak / brass based and in a good, worn condition.
Not marked but a known variation that has been attributed to the company of Wilhelm Deumer from Lüdenscheid. See Weber/Skora, The War Badges of the Kriegsmarine, p.366/367, type 3.43. With the characteristic horizontal pin and top hook.