Ashtray shell signed numbered

Nice enamelled ceramic shell, caramel and ecru color. Originally, it is an ashtray, but it can also be simply decorative, especially in accumulation with other "shell" ceramics. It is in very good condition, neither cracked nor bright. Below there is a signature or stamp that I can not decipher because half erased, and inside a marking (number 67). It measures 15 cm in length, 10 cm in width, 7 cm in height and weighs about 200g.