This is a Batak Shaman's calendar made out of bone and intricately decorated with scrimshaw on both sides. The material is supposed to be whale bone, but it could be from any large mammal. The region where these calendars were used is between Sumatra and Celebes in Indonesia. One side of the artifact has scrimshaw depicting two creatures. One looks like a crab with claws and the other looks like a lizard with a scorpion tail. The concave side has the calendar which has 30 rows and 12 columns, so it is nearly one square per day of the year. The calendar has diagonal bands that separate the squares by 7 units, another mark of a calendal design. One end of the calendar is pierced for the insertion of a string. This is a small shaman calendar. Some of these are made very large. This artifact is old and in very nice condition.