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Ideally whoever found the object would excavate it properly and note what other object and what organic material has been found in the same (undisturbed) stratum. Comparisons to other objects of known age and provenance can be made based on location of find, style of the object, and style and age of the associated objects. If there are organic objects which are part of the original art object or in close association carbon dating can provide some reference. A close examination of toolmarks can be helpful. Any materials and techniques used should be compatible with the proposed age of the object in question. All which means that the authentication should be performed by an expert in the field. There is more info at the link. Google will help you too.