The Antique Tribal Art Dealers Association (ATADA), was founded in 1988, by a group of independent antique tribal art dealers to form a professional association of dealers that would provide education for the public and set standards for the trade. They recognized that tribal and ethnographic art had reached a level of specialization found in other art fields and were concerned by the volume of misidentified and pastiche materials on the market. Members offer buyers a guarantee that objects they sell are as represented regarding age, authenticity and extent of restoration. - Source: Wikipedia
