I have seen chinese knock off vises up close, they are not as smooth as american ones. It is worth the extra money if you intend to be at all serious.
I can't remember for sure but I think they even put the GRS logo on the vise, don't quote me though I have the memory of a goldfish.
Save up and buy the real gear though for sure.
Thanks for posting this 'buyers beware'.
Yes, some copy everything and make counterfeits, and some copy everything but change the name to CRS in order to fool the buyers and avoid legal issues. They are bottom dwellers.
As for smoothness, a vise that lacks smooth rotation has zero value to an engraver. In fact it's laughable that it could even leave the factory in that condition, but the people who cobble this crap together aren't engravers so they don't really know what they're making or how it's supposed to function. The people who get stung are the buyer who is trying to save money and the manufacturer whose products are pirated.