Most of the early 1870/80 jigged bone gun grips and other bone items were made by individuals or small  shops. In 1891 the Rogers Manufacturing Company of Rockfall, Connecticut started making manufactured bone products, and bone fertilizer. They began to make jigged bone handles for knives and guns around the turn of the century.  Though these distinctive grips are no longer made commercially, hand made "Indian Trail" jigged bone stocks are still available from River Junction Trade Company.