The NS Studentenbund is bad as well - the RZM code is a fantasy. There was no "BM" - commonly seen on a variety of HJ fakes. I suspect it is from a supplier in the UK named Nicholas Morigi: http://www.nicholasmorigi.com . He sells them as fakes, but the resellers don't.
Another general give-away of otherwise good looking modern fakes is the "sunken" enamel on the front.
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