A bigger problem than actual counterfeiting is 'copying', where low-cost products just happen to look almost identical to well-known brands, and sometimes even carry a very similar part number. These are sometimes passed-off by unscrupulous sellers as "made in the Chinese factory of XXX" where XXX represents the well-known brand name. In the cases I've investigated it seems that the 'design' process of the backstreet manufacturer was to dismantle a genuine product and copy the dimensions of all the parts, but without knowing the material specifications that's clearly not good enough. Marking on some of these products claiming to meet a standard is meaningless - they are just copying the markings on the product as well as its shape.