F++/F+++, with a minor attempted drill on posterior dorsal area on the right valve, hardly visible, without any drill in the interior of the shell! Unique pattern! Notice the pattern of this shell: She laughs and shows her teeth; see the right valve! Unique shell! I'm not sure about ID; it can be Lioconcha genera! A great shell for Connoisseurs! OUT FROM MY PERSONAL COLLECTION! Nacala Bay area, North of Mozambique dive 2-8 mts. 2000 BIV00875