Fairly heavy, aluminium & green leather thing with 4 legs, a rectangular hole at the top and a circular hole at the bottom

Fairly heavy, aluminium & green leather thing with 4 legs, a rectangular hole at the top and a circular hole at the bottom. Any ideas ?
Answer: “It fits business cards vertically. Not horizontally though, and all of the desk-based business card holders I see on Google hold them horizontally. So not entirely convinced but a strong contender”