What we call " German silver" was massively manufactured in Europe since 18 century. Prior to that, it was made in China for centuries (" paktong") and exported far and wide. It is an alloy of copper and nickel, often containing zinc as well.
German jewelers figured out the formula and started making it on their own.
Battara is correct: any local jeweler will be able to give you 100% correct answer, but just by looking at the Dha I suspect a cheap alloy: paktong.
I am not certain about the kindjal, but it is quite modern.
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