This is a vintage Japanese cake mold, called Kashigata which are hand carved from wood and comes in various shapes from the Early Showa (1920's-1940's).
The wood is dried for 5 years to prevent cracking. Mixtures of sugar and soy flour are pressed into it and allowed to dry. The sweets, called kashi, were sold in confectionery stores and made for special occasions. The molds are crafted by only a few craftsman these days and are an interesting and beautiful piece of old Japan. They are quite collectible and are one-of-a-kind works of art.