SS marked belt: SS 189/39 RZM

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Hi everyone,

I received this SS marked belt. What is strange is the hook which looks like the one I know from police or red cross buckles.
Nevertheless the stamps look somehow genuine and worn out, matching the overall condition of the belt.
Really hard to read, could be "SS 189/39 RZM"

But I am not an expert. I am curious to hear your opinion.

Cheers,
Christian

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where are the SS experts ? ;-)