There are lots and lots of frit weights around with various names and initials and designs. In some the name clearly indicates a northern European origin, and these probably come from Belgium / Alsace / Czech Republic. I recall Gary McClanahan giving a talk to a PCA Convention where he said he had identified 'over 130' US Mid West glass factories who had made some frit paperweights! So I doubt you will determine exactly who made this paperweight.
I have not seen any on offer from China, though.