Silver Close Combat Clasp. Type „Six Dot“.

Zinc based and in an excellent, probably unworn condition with practically all of the silver plate still present and some patina. The magnetic backing plate with most of the dark oxidised finish.
Not marked but a known variation that is commonly referred to as the „Six Dot“ due to the six centre punch dents used to hold the backplate.
See Thomas Durante, The German Close Combat Clasp.
Nice condition example.