Almost certainly a fake.
Just for the record, the RSK Mk5 is made in China.
Just curious how you can tell it is a fake. There is a lot of stuff being made in Chinese factories that does not make it to normal sales channels but still is the real thing. Is there some clue in the picture of the item that is not real obvious to me?
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.
Bob