I would say this is a netsuke - originally Kimonos were made without pockets , so small personal items would have to be carried in a bag or small box that would be attached by strings to the obi (belt or sash) that fastened to the kimono. The string would be passed through two holes in the netsuke,which acted as a toggle to stop the bag or box slipping off the obi. most netsukes are made from wood & ivory but some are made from silver, tortoiseshell, pottery and stone. Check it carefully for an artists signature and could you post very clear up close photos so we can see the degree of detail all has to do with price & SOME can range over $8,000.00 .