Apparently it is genuine, authentic for a Penan type parang...taking over from rattan. When Stuart acquired the parang he got me (not this one) he asked for traditional materials, rattan and tree resin; the locals thought he was a bit thick and kept trying to explain how much better packing strap was, "...it not rot!"
There is something to know about the wooden sheaths though, the wood used by the Penan is specially chosen because it does not readily absorb more water and swell, so the fit of the sheath changes as little as possible. My sheath is cherry, and although I treated it with hot wax, it takes on moisture readily. Wooden sheaths made in the UK and taken to the tropics are likely to swell so much that the blades can't be drawn. Not sure how your Teak would fair, probably better than cherry. Just a thought for anyone planning to take a parang on a jungle adventure.