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So my next attempt at cheap attenuator is https://www.ebay.com/itm/225193692415,maybe will have better luck.
Stainless knurling is shallow. I would agree that yours is fake. For comparison this looks legit to me: https://www.ebay.com/itm/203214649459
Based on this picture https://www.rfpage.com/rf-attenuators-how-to-choose-a-proper-one/ the construction of the *Pasternack* attenatuator seems proper. So if it is a fake, it could be only in the materials used in chip resistors, would be hard to verify.