Carl Mertens Balance cup stainless steel, VNTG

Hard-to-find cup by Carl Mertens, made of 18/10 stainless-steel; the bottom is round, so it rocks (deliberately!). Use it for drinks or nuts or as a sculptural objet or to hold paper clips on a desk! Vintage but lightly used so in great shape, no crazy scratches. I just have one of these, although originally sold as a set. About 3” across.