There are many in museums, but your best bet is probably just comparing them to ones online, and in good museum collections. I see no reason at all to think there is anything doubtful about it. The fact that it is cast copper speaks volumes, and the aged marks/surface on it is pretty evident. Apparantly they made them out of many materials, stone, metal even gold. A holiday to Peru and visit to the relevant authorities in the National Museum should confirm
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