Scrimshaw is bone or ivory or whale's teeth carved by sailors and others for entertainment during the sailing-ship days. Some scrimshaw was carved as early as 1800. There are modern scrimshanders making pieces today on bone, ivory, or plastic. Scrimshaw more than 100 years old can be bought and sold. The sale of newer whale tooth ivory is restricted by the endangered species laws. Other pieces may be found in the Ivory and Nautical categories.