One can often tell the older masks made for use from the newer masks made to sell as decorations by the number of holes for the attatchment strings. One made to be worn will have a hole at the top and one on each side, where a sort of harness of strings would have been put. On the oldest examples these holes would have been made by burning through the wood with a red hot piece of wire or drilled with a bow drill using a homemade bit, leaving a tapered hole. Newer examples will show a completely round hole made with a modern-style twist bit, and often only the hole at the top of the mask is present, as they are not meant to be worn, but hung on a wall. Older specimans will have the eye holes shaped with a knife. New ones made with modern tools will commonly have perfectly round eye holes just the size of a modern drill bit. One of the best ways to tell if an example was made for use is to hold it up to your face and see if the eye holes are in the right place for an ordinary human to see through, and if there is space for your nose. A few in my collection still have a wearing harness and have stains on the inside showing that they were once worn by someone with a not-overly clean nose.