These were recently on eBay, but since pulled, they started attracted high bids. This seller seems to offer these very rare knots from time-to-time, any always seems to have several, always in near mint condition.

While I was keen to bid, they just don't look right to me, the cord used to make the ball and crown is fairly thick compared to others I've seen, and reqular bayo knots. Any opinion as to the authenticity of these...

Red

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Teno Knot