Empty rectangular pocket in sandstone pyrity signed

Delightful rectangular container in sandstone pyrity varnished in khaki, brown and beige tones. It would make a perfect pocket empty in an entrance, a very practical pen receptacle on a desk, or could also be used in a bathroom to put some soaps or accessories. On the two largest ledges, it is decorated with a hollow heart. It has a signature inside, but I can't decipher it, "clo2" maybe... It is in very good condition, neither shine nor crack, just some gaps on the enamelling, which I think is original. It measures 27 cm by 14 cm, for 4.5 cm in height and weighs just under 900g.