Tombak/brass based and in a good, somewhat worn condition with remains of the original finish and patina.
Not marked but a known variation that has been attributed to the company of Steinhauer &Lück from Lüdenscheid. See Weber/Skora, The War Badges of the Kriegsmarine.

Zinc based and in a good, somewhat worn condition.
Not marked but a known variation that has been attributed to the company of Steinhauer & Lück from Lüdenscheid. See Weber/Skora, The War Badges of the Kriegsmarine.
Has been bent to a convex shape by the wearer for a better fit to the uniform.

Tombak/ brass based and in a very good, slightly worn condition. The wreath with remains of the gilt plate, the explosion with patina and the waves dark oxidised.
Not marked but a known variation that has been attributed to the company of Steinhauer & Lück from Lüdenscheid. See Weber/Skora, The War Badges of the Kriegsmarine p.302/303, type 3.18, variant 1.
Difficult to find the early type from this maker.