This is a vintage mold called "kashigata".
Often made of sakura (cherry wood) and seasoned for about 3 years before carving, kashigata were used to make dried confectionery made of rice flour and sugar called rakugan. Earliest records show that this practice dates back to the mid-17th century. These confections were used as offerings and snacks for celebratory occasions and even unfortunate events. For example when a person died, it was expensive to give flowers or fresh food so, people made these